1714 lines
57 KiB
C
1714 lines
57 KiB
C
// Parse code using recursive descent
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#include <ctype.h>
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#include <gc.h>
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#include <libgen.h>
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#include <linux/limits.h>
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#include <setjmp.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistr.h>
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#include <unictype.h>
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#include <signal.h>
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#include "ast.h"
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#include "util.h"
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static const char closing[128] = {['(']=')', ['[']=']', ['<']='>', ['{']='}'};
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typedef struct {
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file_t *file;
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jmp_buf *on_err;
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} parse_ctx_t;
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typedef ast_t* (parser_t)(parse_ctx_t*,const char*);
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extern void builtin_fail(const char *fmt, ...);
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#define PARSER(name) ast_t *name(parse_ctx_t *ctx, const char *pos)
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#define STUB_PARSER(name) PARSER(name) { (void)ctx; (void)pos; return NULL; }
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int op_tightness[] = {
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[BINOP_POWER]=1,
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[BINOP_MULT]=2, [BINOP_DIVIDE]=2, [BINOP_MOD]=2, [BINOP_MOD1]=2,
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[BINOP_PLUS]=3, [BINOP_MINUS]=3,
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[BINOP_CONCAT]=4,
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[BINOP_LSHIFT]=5, [BINOP_RSHIFT]=5,
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[BINOP_MIN]=6, [BINOP_MAX]=6,
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[BINOP_EQ]=7, [BINOP_NE]=7,
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[BINOP_LT]=8, [BINOP_LE]=8, [BINOP_GT]=8, [BINOP_GE]=8,
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[BINOP_AND]=9, [BINOP_OR]=9, [BINOP_XOR]=9,
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};
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static const char *keywords[] = {
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"yes", "xor", "while", "use", "then", "struct", "stop", "skip", "return",
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"or", "not", "no", "mod1", "mod", "in", "if", "func", "for", "extern",
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"enum", "else", "do", "and", "_mix_", "_min_", "_max_",
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NULL,
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};
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enum {NORMAL_FUNCTION=0, EXTERN_FUNCTION=1};
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static inline size_t some_of(const char **pos, const char *allow);
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static inline size_t some_not(const char **pos, const char *forbid);
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static inline size_t spaces(const char **pos);
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static inline size_t whitespace(const char **pos);
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static inline size_t match(const char **pos, const char *target);
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static inline void expect_str(parse_ctx_t *ctx, const char *start, const char **pos, const char *target, const char *fmt, ...);
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static inline void expect_closing(parse_ctx_t *ctx, const char **pos, const char *target, const char *fmt, ...);
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static inline size_t match_word(const char **pos, const char *word);
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static inline const char* get_word(const char **pos);
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static inline const char* get_id(const char **pos);
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static inline bool comment(const char **pos);
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static inline bool indent(parse_ctx_t *ctx, const char **pos);
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static inline binop_e match_binary_operator(const char **pos);
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static ast_t *parse_fncall_suffix(parse_ctx_t *ctx, ast_t *fn, bool is_extern);
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static ast_t *parse_field_suffix(parse_ctx_t *ctx, ast_t *lhs);
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static ast_t *parse_index_suffix(parse_ctx_t *ctx, ast_t *lhs);
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static arg_ast_t *parse_args(parse_ctx_t *ctx, const char **pos, bool allow_unnamed);
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static PARSER(parse_for);
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static PARSER(parse_while);
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static PARSER(parse_if);
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static PARSER(parse_expr);
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static PARSER(parse_extended_expr);
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static PARSER(parse_term_no_suffix);
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static PARSER(parse_term);
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static PARSER(parse_inline_block);
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static PARSER(parse_statement);
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static PARSER(parse_block);
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static PARSER(parse_opt_indented_block);
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static PARSER(parse_var);
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static PARSER(parse_enum_def);
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static PARSER(parse_struct_def);
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static PARSER(parse_string);
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static PARSER(parse_func_def);
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static PARSER(parse_extern);
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static PARSER(parse_declaration);
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static PARSER(parse_doctest);
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static PARSER(parse_use);
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static PARSER(parse_linker);
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static PARSER(parse_namespace);
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static type_ast_t *parse_type(parse_ctx_t *ctx, const char *pos);
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//
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// Print a parse error and exit (or use the on_err longjmp)
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//
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__attribute__((noreturn))
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static void vparser_err(parse_ctx_t *ctx, const char *start, const char *end, const char *fmt, va_list args) {
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if (isatty(STDERR_FILENO) && !getenv("NO_COLOR"))
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fputs("\x1b[31;1;7m", stderr);
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fprintf(stderr, "%s:%ld.%ld: ", ctx->file->relative_filename, get_line_number(ctx->file, start),
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get_line_column(ctx->file, start));
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vfprintf(stderr, fmt, args);
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if (isatty(STDERR_FILENO) && !getenv("NO_COLOR"))
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fputs(" \x1b[m", stderr);
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fputs("\n\n", stderr);
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fprint_span(stderr, ctx->file, start, end, "\x1b[31;1;7m", 2, isatty(STDERR_FILENO) && !getenv("NO_COLOR"));
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fputs("\n", stderr);
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if (ctx->on_err)
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longjmp(*ctx->on_err, 1);
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raise(SIGABRT);
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exit(1);
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}
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//
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// Wrapper for vparser_err
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//
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__attribute__((noreturn))
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static void parser_err(parse_ctx_t *ctx, const char *start, const char *end, const char *fmt, ...) {
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va_list args;
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va_start(args, fmt);
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vparser_err(ctx, start, end, fmt, args);
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va_end(args);
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}
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//
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// Convert an escape sequence like \n to a string
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//
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const char *unescape(const char **out) {
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const char **endpos = out;
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const char *escape = *out;
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static const char *unescapes[256] = {['a']="\a",['b']="\b",['e']="\e",['f']="\f",['n']="\n",['r']="\r",['t']="\t",['v']="\v",['_']=" "};
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assert(*escape == '\\');
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if (unescapes[(int)escape[1]]) {
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*endpos = escape + 2;
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return heap_str(unescapes[(int)escape[1]]);
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} else if (escape[1] == 'x' && escape[2] && escape[3]) {
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char *endptr = (char*)&escape[3+1];
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char c = (char)strtol(escape+2, &endptr, 16);
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*endpos = escape + 4;
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return heap_strn(&c, 1);
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} else if ('0' <= escape[1] && escape[1] <= '7' && '0' <= escape[2] && escape[2] <= '7' && '0' <= escape[3] && escape[3] <= '7') {
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char *endptr = (char*)&escape[4];
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char c = (char)strtol(escape+1, &endptr, 8);
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*endpos = escape + 4;
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return heap_strn(&c, 1);
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} else {
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*endpos = escape + 2;
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return heap_strn(escape+1, 1);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////// Text-based parsing primitives ///////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////
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size_t some_of(const char **pos, const char *allow) {
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size_t len = strspn(*pos, allow);
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*pos += len;
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return len;
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}
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size_t some_not(const char **pos, const char *forbid) {
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size_t len = strcspn(*pos, forbid);
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*pos += len;
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return len;
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}
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size_t spaces(const char **pos) {
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return some_of(pos, " \t");
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}
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size_t whitespace(const char **pos) {
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const char *p0 = *pos;
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while (some_of(pos, " \t\r\n") || comment(pos))
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continue;
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return (size_t)(*pos - p0);
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}
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size_t match(const char **pos, const char *target) {
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size_t len = strlen(target);
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if (strncmp(*pos, target, len) != 0)
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return 0;
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*pos += len;
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return len;
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}
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static inline bool is_xid_continue_next(const char *pos) {
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ucs4_t point = 0;
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u8_next(&point, (const uint8_t*)pos);
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return uc_is_property_xid_continue(point);
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}
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//
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// Expect a string (potentially after whitespace) and emit a parser error if it's not there
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//
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static void expect_str(
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parse_ctx_t *ctx, const char *start, const char **pos, const char *target, const char *fmt, ...) {
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spaces(pos);
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if (match(pos, target)) {
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char lastchar = target[strlen(target)-1];
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if (!(isalpha(lastchar) || isdigit(lastchar) || lastchar == '_'))
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return;
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if (!is_xid_continue_next(*pos))
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return;
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}
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if (isatty(STDERR_FILENO) && !getenv("NO_COLOR"))
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fputs("\x1b[31;1;7m", stderr);
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va_list args;
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va_start(args, fmt);
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vparser_err(ctx, start, *pos, fmt, args);
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va_end(args);
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}
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//
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// Helper for matching closing parens with good error messages
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//
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static void expect_closing(
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parse_ctx_t *ctx, const char **pos, const char *closing, const char *fmt, ...) {
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const char *start = *pos;
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spaces(pos);
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if (match(pos, closing))
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return;
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const char *eol = strchr(*pos, '\n');
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const char *next = strstr(*pos, closing);
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const char *end = eol < next ? eol : next;
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if (isatty(STDERR_FILENO) && !getenv("NO_COLOR"))
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fputs("\x1b[31;1;7m", stderr);
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va_list args;
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va_start(args, fmt);
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vparser_err(ctx, start, end, fmt, args);
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va_end(args);
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}
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#define expect(ctx, start, pos, parser, ...) ({ \
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const char **_pos = pos; \
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spaces(_pos); \
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auto _result = parser(ctx, *_pos); \
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if (!_result) { \
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if (isatty(STDERR_FILENO) && !getenv("NO_COLOR")) \
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fputs("\x1b[31;1;7m", stderr); \
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parser_err(ctx, start, *_pos, __VA_ARGS__); \
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} \
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*_pos = _result->end; \
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_result; })
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#define optional(ctx, pos, parser) ({ \
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const char **_pos = pos; \
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spaces(_pos); \
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auto _result = parser(ctx, *_pos); \
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if (_result) *_pos = _result->end; \
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_result; })
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size_t match_word(const char **out, const char *word) {
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const char *pos = *out;
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spaces(&pos);
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if (!match(&pos, word) || is_xid_continue_next(pos))
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return 0;
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*out = pos;
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return strlen(word);
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}
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bool match_group(const char **out, char open) {
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static char mirror_delim[256] = {['(']=')', ['{']='}', ['<']='>', ['[']=']'};
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const char *pos = *out;
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if (*pos != open) return 0;
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char close = mirror_delim[(int)open] ? mirror_delim[(int)open] : open;
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int depth = 1;
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for (++pos; *pos && depth > 0; ++pos) {
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if (*pos == close) --depth;
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else if (*pos == open) ++depth;
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}
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if (depth == 0) {
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*out = pos;
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return true;
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} else return false;
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}
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const char *get_word(const char **inout) {
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const char *word = *inout;
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spaces(&word);
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const uint8_t *pos = (const uint8_t*)word;
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ucs4_t point;
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pos = u8_next(&point, pos);
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if (!uc_is_property_xid_start(point) && point != '_')
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return NULL;
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for (const uint8_t *next; (next = u8_next(&point, pos)); pos = next) {
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if (!uc_is_property_xid_continue(point))
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break;
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}
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*inout = (const char*)pos;
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return heap_strn(word, (size_t)((const char*)pos - word));
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}
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const char *get_id(const char **inout) {
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const char *pos = *inout;
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const char *word = get_word(&pos);
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if (!word) return word;
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for (int i = 0; keywords[i]; i++)
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if (strcmp(word, keywords[i]) == 0)
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return NULL;
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*inout = pos;
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return word;
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}
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bool comment(const char **pos) {
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if (!match(pos, "//"))
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return false;
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some_not(pos, "\r\n");
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return true;
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}
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bool indent(parse_ctx_t *ctx, const char **out) {
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const char *pos = *out;
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int64_t starting_indent = get_indent(ctx->file, pos);
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whitespace(&pos);
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const char *start_of_line = get_line(ctx->file, get_line_number(ctx->file, pos));
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if (start_of_line <= *out)
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return false;
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if ((int64_t)strspn(start_of_line, "\t") < starting_indent)
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return false;
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*out = start_of_line + starting_indent + 1;
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return true;
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}
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bool newline_with_indentation(const char **out, int64_t target) {
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const char *pos = *out;
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if (*pos == '\r') ++pos;
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if (*pos != '\n') return false;
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++pos;
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if (*pos == '\r' || *pos == '\n' || *pos == '\0') {
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// Empty line
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*out = pos;
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return true;
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}
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if ((int64_t)strspn(pos, "\t") >= target) {
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*out = pos + target;
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return true;
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}
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return false;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////// AST-based parsers /////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////
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PARSER(parse_parens) {
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const char *start = pos;
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spaces(&pos);
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if (!match(&pos, "(")) return NULL;
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whitespace(&pos);
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ast_t *expr = optional(ctx, &pos, parse_extended_expr);
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if (!expr) return NULL;
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expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this expression");
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// Update the span to include the parens:
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return new(ast_t, .file=(ctx)->file, .start=start, .end=pos,
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.tag=expr->tag, .__data=expr->__data);
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}
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PARSER(parse_int) {
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const char *start = pos;
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bool negative = match(&pos, "-");
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if (!isdigit(*pos)) return false;
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int64_t i = 0;
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if (match(&pos, "0x")) { // Hex
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size_t span = strspn(pos, "0123456789abcdefABCDEF_");
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char *buf = GC_MALLOC_ATOMIC(span+1);
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memset(buf, 0, span+1);
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for (char *src = (char*)pos, *dest = buf; src < pos+span; ++src) {
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if (*src != '_') *(dest++) = *src;
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}
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i = strtol(buf, NULL, 16);
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pos += span;
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} else if (match(&pos, "0b")) { // Binary
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size_t span = strspn(pos, "01_");
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char *buf = GC_MALLOC_ATOMIC(span+1);
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memset(buf, 0, span+1);
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for (char *src = (char*)pos, *dest = buf; src < pos+span; ++src) {
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if (*src != '_') *(dest++) = *src;
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}
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i = strtol(buf, NULL, 2);
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pos += span;
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} else if (match(&pos, "0o")) { // Octal
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size_t span = strspn(pos, "01234567_");
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char *buf = GC_MALLOC_ATOMIC(span+1);
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memset(buf, 0, span+1);
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for (char *src = (char*)pos, *dest = buf; src < pos+span; ++src) {
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if (*src != '_') *(dest++) = *src;
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}
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i = strtol(buf, NULL, 8);
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pos += span;
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} else { // Decimal
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size_t span = strspn(pos, "0123456789_");
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char *buf = GC_MALLOC_ATOMIC(span+1);
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memset(buf, 0, span+1);
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for (char *src = (char*)pos, *dest = buf; src < pos+span; ++src) {
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if (*src != '_') *(dest++) = *src;
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}
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i = strtol(buf, NULL, 10);
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pos += span;
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}
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if (match(&pos, "e") || match(&pos, "f")) // floating point literal
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return NULL;
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if (negative) i *= -1;
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if (match(&pos, "%")) {
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double d = (double)i / 100.;
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return NewAST(ctx->file, start, pos, Num, .n=d, .precision=64);
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}
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match(&pos, "_");
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int64_t precision = 64;
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if (match(&pos, "i64")) precision = 64;
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else if (match(&pos, "i32")) precision = 32;
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else if (match(&pos, "i16")) precision = 16;
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else if (match(&pos, "i8")) precision = 8;
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// else if (match(&pos, ".") || match(&pos, "e")) return NULL; // looks like a float
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return NewAST(ctx->file, start, pos, Int, .i=i, .precision=precision);
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}
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type_ast_t *parse_table_type(parse_ctx_t *ctx, const char *pos) {
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const char *start = pos;
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if (!match(&pos, "{")) return NULL;
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whitespace(&pos);
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type_ast_t *key_type = parse_type(ctx, pos);
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if (!key_type) return NULL;
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pos = key_type->end;
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whitespace(&pos);
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if (!match(&pos, "=>")) return NULL;
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type_ast_t *value_type = expect(ctx, start, &pos, parse_type, "I couldn't parse the rest of this table type");
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whitespace(&pos);
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expect_closing(ctx, &pos, "}", "I wasn't able to parse the rest of this table type");
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return NewTypeAST(ctx->file, start, pos, TableTypeAST, .key=key_type, .value=value_type);
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}
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type_ast_t *parse_func_type(parse_ctx_t *ctx, const char *pos) {
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const char *start = pos;
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if (!match_word(&pos, "func")) return NULL;
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spaces(&pos);
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if (!match(&pos, "(")) return NULL;
|
|
arg_ast_t *args = parse_args(ctx, &pos, true);
|
|
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this function type");
|
|
spaces(&pos);
|
|
if (!match(&pos, "->")) return NULL;
|
|
type_ast_t *ret = optional(ctx, &pos, parse_type);
|
|
return NewTypeAST(ctx->file, start, pos, FunctionTypeAST, .args=args, .ret=ret);
|
|
}
|
|
|
|
type_ast_t *parse_array_type(parse_ctx_t *ctx, const char *pos) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "[")) return NULL;
|
|
type_ast_t *type = expect(ctx, start, &pos, parse_type,
|
|
"I couldn't parse an array item type after this point");
|
|
expect_closing(ctx, &pos, "]", "I wasn't able to parse the rest of this array type");
|
|
return NewTypeAST(ctx->file, start, pos, ArrayTypeAST, .item=type);
|
|
}
|
|
|
|
type_ast_t *parse_pointer_type(parse_ctx_t *ctx, const char *pos) {
|
|
const char *start = pos;
|
|
bool optional = false, is_stack = false;
|
|
if (match(&pos, "@"))
|
|
optional = false;
|
|
else if (match(&pos, "?"))
|
|
optional = true;
|
|
else if (match(&pos, "&"))
|
|
is_stack = true;
|
|
else
|
|
return NULL;
|
|
|
|
spaces(&pos);
|
|
bool is_readonly = match(&pos, "(readonly)");
|
|
spaces(&pos);
|
|
type_ast_t *type = expect(ctx, start, &pos, parse_type,
|
|
"I couldn't parse a pointer type after this point");
|
|
return NewTypeAST(ctx->file, start, pos, PointerTypeAST, .pointed=type, .is_optional=optional, .is_stack=is_stack, .is_readonly=is_readonly);
|
|
}
|
|
|
|
type_ast_t *parse_type_name(parse_ctx_t *ctx, const char *pos) {
|
|
const char *start = pos;
|
|
const char *id = get_id(&pos);
|
|
if (!id) return NULL;
|
|
for (;;) {
|
|
const char *next = pos;
|
|
spaces(&next);
|
|
if (!match(&next, ".")) break;
|
|
const char *next_id = get_id(&next);
|
|
if (!next_id) break;
|
|
id = heap_strf("%s.%s", id, next_id);
|
|
pos = next;
|
|
}
|
|
return NewTypeAST(ctx->file, start, pos, VarTypeAST, .name=id);
|
|
}
|
|
|
|
type_ast_t *parse_type(parse_ctx_t *ctx, const char *pos) {
|
|
const char *start = pos;
|
|
type_ast_t *type = NULL;
|
|
bool success = (false
|
|
|| (type=parse_pointer_type(ctx, pos))
|
|
|| (type=parse_array_type(ctx, pos))
|
|
|| (type=parse_table_type(ctx, pos))
|
|
|| (type=parse_type_name(ctx, pos))
|
|
|| (type=parse_func_type(ctx, pos))
|
|
);
|
|
if (!success && match(&pos, "(")) {
|
|
whitespace(&pos);
|
|
type = optional(ctx, &pos, parse_type);
|
|
if (!type) return NULL;
|
|
whitespace(&pos);
|
|
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this type");
|
|
type->start = start;
|
|
type->end = pos;
|
|
}
|
|
|
|
if (!type) return NULL;
|
|
|
|
pos = type->end;
|
|
return type;
|
|
}
|
|
|
|
PARSER(parse_num) {
|
|
const char *start = pos;
|
|
bool negative = match(&pos, "-");
|
|
if (!isdigit(*pos) && *pos != '.') return NULL;
|
|
|
|
size_t len = strspn(pos, "0123456789_");
|
|
if (strncmp(pos+len, "..", 2) == 0)
|
|
return NULL;
|
|
else if (pos[len] == '.')
|
|
len += 1 + strspn(pos + len + 1, "0123456789");
|
|
else if (pos[len] != 'e' && pos[len] != 'f' && pos[len] != '%')
|
|
return NULL;
|
|
if (pos[len] == 'e')
|
|
len += 1 + strspn(pos + len + 1, "-0123456789_");
|
|
char *buf = GC_MALLOC_ATOMIC(len+1);
|
|
memset(buf, 0, len+1);
|
|
for (char *src = (char*)pos, *dest = buf; src < pos+len; ++src) {
|
|
if (*src != '_') *(dest++) = *src;
|
|
}
|
|
double d = strtod(buf, NULL);
|
|
pos += len;
|
|
|
|
if (negative) d *= -1;
|
|
|
|
int64_t precision = 64;
|
|
match(&pos, "_");
|
|
if (match(&pos, "f64")) precision = 64;
|
|
else if (match(&pos, "f32")) precision = 32;
|
|
|
|
if (match(&pos, "%")) {
|
|
d /= 100.;
|
|
}
|
|
|
|
return NewAST(ctx->file, start, pos, Num, .n=d, .precision=precision);
|
|
}
|
|
|
|
PARSER(parse_array) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "[")) return NULL;
|
|
|
|
whitespace(&pos);
|
|
|
|
ast_list_t *items = NULL;
|
|
type_ast_t *item_type = NULL;
|
|
if (match(&pos, ":")) {
|
|
whitespace(&pos);
|
|
item_type = expect(ctx, pos-1, &pos, parse_type, "I couldn't parse a type for this array");
|
|
}
|
|
|
|
for (;;) {
|
|
whitespace(&pos);
|
|
ast_t *item = optional(ctx, &pos, parse_extended_expr);
|
|
if (!item) break;
|
|
items = new(ast_list_t, .ast=item, .next=items);
|
|
whitespace(&pos);
|
|
if (!match(&pos, ",")) break;
|
|
}
|
|
whitespace(&pos);
|
|
expect_closing(ctx, &pos, "]", "I wasn't able to parse the rest of this array");
|
|
|
|
if (!item_type && !items)
|
|
parser_err(ctx, start, pos, "Empty arrays must specify what type they would contain (e.g. [:Int])");
|
|
|
|
REVERSE_LIST(items);
|
|
return NewAST(ctx->file, start, pos, Array, .type=item_type, .items=items);
|
|
}
|
|
|
|
PARSER(parse_table) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "{")) return NULL;
|
|
|
|
whitespace(&pos);
|
|
|
|
ast_list_t *entries = NULL;
|
|
type_ast_t *key_type = NULL, *value_type = NULL;
|
|
if (match(&pos, ":")) {
|
|
whitespace(&pos);
|
|
key_type = expect(ctx, pos-1, &pos, parse_type, "I couldn't parse a key type for this table");
|
|
whitespace(&pos);
|
|
if (!match(&pos, "=>"))
|
|
parser_err(ctx, pos, pos, "I expected an '=>' for this table type");
|
|
value_type = expect(ctx, pos-1, &pos, parse_type, "I couldn't parse a value type for this table");
|
|
}
|
|
|
|
for (;;) {
|
|
whitespace(&pos);
|
|
const char *entry_start = pos;
|
|
ast_t *key = optional(ctx, &pos, parse_extended_expr);
|
|
if (!key) break;
|
|
whitespace(&pos);
|
|
if (!match(&pos, "=>")) return NULL;
|
|
ast_t *value = expect(ctx, pos-1, &pos, parse_expr, "I couldn't parse the value for this table entry");
|
|
|
|
ast_t *entry = NewAST(ctx->file, entry_start, pos, TableEntry, .key=key, .value=value);
|
|
for (bool progress = true; progress; ) {
|
|
ast_t *new_entry;
|
|
progress = (false
|
|
|| (new_entry=parse_index_suffix(ctx, entry))
|
|
|| (new_entry=parse_field_suffix(ctx, entry))
|
|
|| (new_entry=parse_fncall_suffix(ctx, entry, NORMAL_FUNCTION))
|
|
);
|
|
if (progress) entry = new_entry;
|
|
}
|
|
pos = entry->end;
|
|
|
|
entries = new(ast_list_t, .ast=entry, .next=entries);
|
|
whitespace(&pos);
|
|
if (!match(&pos, ",")) break;
|
|
}
|
|
|
|
REVERSE_LIST(entries);
|
|
|
|
if (!key_type && !value_type && !entries)
|
|
return NULL;
|
|
|
|
whitespace(&pos);
|
|
|
|
ast_t *fallback = NULL, *default_val = NULL;
|
|
if (match(&pos, ";")) {
|
|
for (;;) {
|
|
whitespace(&pos);
|
|
const char *attr_start = pos;
|
|
if (match(&pos, "fallback")) {
|
|
whitespace(&pos);
|
|
if (!match(&pos, "=")) parser_err(ctx, attr_start, pos, "I expected an '=' after 'fallback'");
|
|
if (fallback)
|
|
parser_err(ctx, attr_start, pos, "This table already has a fallback");
|
|
fallback = expect(ctx, attr_start, &pos, parse_expr, "I expected a fallback table");
|
|
} else if (match(&pos, "default")) {
|
|
whitespace(&pos);
|
|
if (!match(&pos, "=")) parser_err(ctx, attr_start, pos, "I expected an '=' after 'default'");
|
|
if (default_val)
|
|
parser_err(ctx, attr_start, pos, "This table already has a default value");
|
|
default_val = expect(ctx, attr_start, &pos, parse_expr, "I expected a default value for this table");
|
|
} else {
|
|
break;
|
|
}
|
|
whitespace(&pos);
|
|
if (!match(&pos, ";")) break;
|
|
}
|
|
}
|
|
|
|
whitespace(&pos);
|
|
expect_closing(ctx, &pos, "}", "I wasn't able to parse the rest of this table");
|
|
|
|
return NewAST(ctx->file, start, pos, Table, .key_type=key_type, .value_type=value_type, .entries=entries, .fallback=fallback, .default_value=default_val);
|
|
}
|
|
|
|
ast_t *parse_field_suffix(parse_ctx_t *ctx, ast_t *lhs) {
|
|
if (!lhs) return NULL;
|
|
const char *pos = lhs->end;
|
|
whitespace(&pos);
|
|
if (!match(&pos, ".")) return NULL;
|
|
if (*pos == '.') return NULL;
|
|
whitespace(&pos);
|
|
bool dollar = match(&pos, "$");
|
|
const char* field = get_id(&pos);
|
|
if (!field) return NULL;
|
|
if (dollar) field = heap_strf("$%s", field);
|
|
return NewAST(ctx->file, lhs->start, pos, FieldAccess, .fielded=lhs, .field=field);
|
|
}
|
|
|
|
PARSER(parse_reduction) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "(")) return NULL;
|
|
|
|
spaces(&pos);
|
|
const char *combo_start = pos;
|
|
binop_e op = match_binary_operator(&pos);
|
|
if (op == BINOP_UNKNOWN) return NULL;
|
|
|
|
ast_t *combination;
|
|
ast_t *lhs = NewAST(ctx->file, pos, pos, Var, .name="lhs.0");
|
|
ast_t *rhs = NewAST(ctx->file, pos, pos, Var, .name="rhs.0");
|
|
if (op == BINOP_MIN || op == BINOP_MAX) {
|
|
for (bool progress = true; progress; ) {
|
|
ast_t *new_term;
|
|
progress = (false
|
|
|| (new_term=parse_index_suffix(ctx, rhs))
|
|
|| (new_term=parse_field_suffix(ctx, rhs))
|
|
|| (new_term=parse_fncall_suffix(ctx, rhs, NORMAL_FUNCTION))
|
|
);
|
|
if (progress) rhs = new_term;
|
|
}
|
|
if (rhs->tag == Var) rhs = NULL;
|
|
else pos = rhs->end;
|
|
combination = op == BINOP_MIN ?
|
|
NewAST(ctx->file, combo_start, pos, Min, .lhs=lhs, .rhs=lhs, .key=rhs)
|
|
: NewAST(ctx->file, combo_start, pos, Max, .lhs=lhs, .rhs=lhs, .key=rhs);
|
|
} else {
|
|
combination = NewAST(ctx->file, combo_start, pos, BinaryOp, .op=op, .lhs=lhs, .rhs=rhs);
|
|
}
|
|
|
|
spaces(&pos);
|
|
if (!match(&pos, ")")) return NULL;
|
|
|
|
ast_t *iter = optional(ctx, &pos, parse_extended_expr);
|
|
if (!iter) return NULL;
|
|
|
|
ast_t *fallback = NULL;
|
|
if (match_word(&pos, "else"))
|
|
fallback = expect(ctx, pos-4, &pos, parse_expr, "I couldn't parse the expression after this 'else'");
|
|
|
|
return NewAST(ctx->file, start, pos, Reduction, .iter=iter, .combination=combination, .fallback=fallback);
|
|
}
|
|
|
|
ast_t *parse_index_suffix(parse_ctx_t *ctx, ast_t *lhs) {
|
|
if (!lhs) return NULL;
|
|
const char *start = lhs->start;
|
|
const char *pos = lhs->end;
|
|
if (!match(&pos, "[")) return NULL;
|
|
whitespace(&pos);
|
|
ast_t *index = NULL;
|
|
if (match(&pos, ".")) {
|
|
// array[.field]
|
|
const char *field_start = pos-1;
|
|
const char *field = get_id(&pos);
|
|
if (field)
|
|
index = NewAST(ctx->file, field_start, pos, FieldAccess, .field=field);
|
|
else
|
|
--pos;
|
|
}
|
|
|
|
if (!index) {
|
|
// obj[expr]
|
|
index = optional(ctx, &pos, parse_extended_expr);
|
|
}
|
|
whitespace(&pos);
|
|
bool unchecked = match(&pos, ";") && (spaces(&pos), match_word(&pos, "unchecked") != 0);
|
|
expect_closing(ctx, &pos, "]", "I wasn't able to parse the rest of this index");
|
|
return NewAST(ctx->file, start, pos, Index, .indexed=lhs, .index=index, .unchecked=unchecked);
|
|
}
|
|
|
|
PARSER(parse_if) {
|
|
// if <condition> [then] <body> [else <body>]
|
|
const char *start = pos;
|
|
int64_t starting_indent = get_indent(ctx->file, pos);
|
|
|
|
if (!match_word(&pos, "if"))
|
|
return NULL;
|
|
|
|
ast_t *condition = optional(ctx, &pos, parse_declaration);
|
|
if (!condition) condition = expect(ctx, start, &pos, parse_expr,
|
|
"I expected to find an expression for this 'if'");
|
|
|
|
match_word(&pos, "then"); // optional
|
|
|
|
ast_t *body = expect(ctx, start, &pos, parse_opt_indented_block, "I expected a body for this 'if' statement");
|
|
|
|
const char *tmp = pos;
|
|
whitespace(&tmp);
|
|
ast_t *else_body = NULL;
|
|
if (get_indent(ctx->file, tmp) == starting_indent && match_word(&tmp, "else")) {
|
|
pos = tmp;
|
|
else_body = expect(ctx, start, &pos, parse_opt_indented_block, "I expected a body for this 'else'");
|
|
}
|
|
return NewAST(ctx->file, start, pos, If, .condition=condition, .body=body, .else_body=else_body);
|
|
}
|
|
|
|
PARSER(parse_for) {
|
|
// for [k,] v in iter [<indent>] body
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "for")) return NULL;
|
|
ast_t *index = expect(ctx, start, &pos, parse_var, "I expected an iteration variable for this 'for'");
|
|
spaces(&pos);
|
|
ast_t *value = NULL;
|
|
if (match(&pos, ",")) {
|
|
value = expect(ctx, pos-1, &pos, parse_var, "I expected a variable after this comma");
|
|
}
|
|
expect_str(ctx, start, &pos, "in", "I expected an 'in' for this 'for'");
|
|
ast_t *iter = expect(ctx, start, &pos, parse_expr, "I expected an iterable value for this 'for'");
|
|
match(&pos, "do"); // optional
|
|
ast_t *body = expect(ctx, start, &pos, parse_opt_indented_block, "I expected a body for this 'for'");
|
|
return NewAST(ctx->file, start, pos, For, .index=value ? index : NULL, .value=value ? value : index, .iter=iter, .body=body);
|
|
}
|
|
|
|
PARSER(parse_while) {
|
|
// while condition [do] [<indent>] body
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "while")) return NULL;
|
|
ast_t *condition = expect(ctx, start, &pos, parse_expr, "I don't see a viable condition for this 'while'");
|
|
match(&pos, "do"); // optional
|
|
ast_t *body = expect(ctx, start, &pos, parse_opt_indented_block, "I expected a body for this 'while'");
|
|
const char *tmp = pos;
|
|
whitespace(&tmp);
|
|
return NewAST(ctx->file, start, pos, While, .condition=condition, .body=body);
|
|
}
|
|
|
|
PARSER(parse_heap_alloc) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "@")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *val = expect(ctx, start, &pos, parse_expr, "I expected an expression for this '@'");
|
|
return NewAST(ctx->file, start, pos, UnaryOp, .op=UNOP_HEAP_ALLOCATE, .value=val);
|
|
}
|
|
|
|
PARSER(parse_stack_reference) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "&")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *val = expect(ctx, start, &pos, parse_expr, "I expected an expression for this '&'");
|
|
return NewAST(ctx->file, start, pos, UnaryOp, .op=UNOP_STACK_REFERENCE, .value=val);
|
|
}
|
|
|
|
PARSER(parse_not) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "not")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *val = expect(ctx, start, &pos, parse_expr, "I expected an expression for this 'not'");
|
|
return NewAST(ctx->file, start, pos, UnaryOp, .op=UNOP_NOT, .value=val);
|
|
}
|
|
|
|
PARSER(parse_negative) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "-")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *val = expect(ctx, start, &pos, parse_term, "I expected an expression for this '-'");
|
|
return NewAST(ctx->file, start, pos, UnaryOp, .op=UNOP_NEGATIVE, .value=val);
|
|
}
|
|
|
|
PARSER(parse_bool) {
|
|
const char *start = pos;
|
|
if (match_word(&pos, "yes"))
|
|
return NewAST(ctx->file, start, pos, Bool, .b=true);
|
|
else if (match_word(&pos, "no"))
|
|
return NewAST(ctx->file, start, pos, Bool, .b=false);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
PARSER(parse_string) {
|
|
// ["$" [interp-char [closing-interp-char]]] ('"' ... '"' / "'" ... "'")
|
|
const char *start = pos;
|
|
|
|
// Escape sequence, e.g. \r\n
|
|
if (*pos == '\\') {
|
|
CORD cord = CORD_EMPTY;
|
|
do {
|
|
char c = unescape(&pos)[0];
|
|
cord = CORD_cat_char(cord, c);
|
|
} while (*pos == '\\');
|
|
return NewAST(ctx->file, start, pos, StringLiteral, .cord=cord);
|
|
}
|
|
|
|
char open_quote, close_quote, open_interp = '\x03', close_interp = '\x02';
|
|
if (match(&pos, "\"")) {
|
|
open_quote = '"', close_quote = '"', open_interp = '{', close_interp = '}';
|
|
} else if (match(&pos, "$")) {
|
|
open_interp = *(pos++);
|
|
close_interp = closing[(int)open_interp];
|
|
if (*pos == close_interp) ++pos;
|
|
open_quote = *pos;
|
|
close_quote = closing[(int)*pos] ? closing[(int)*pos] : *pos;
|
|
++pos;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
|
|
// printf("Parsing string: '%c' .. '%c' interp: '%c%c'\n", *start, close_quote, open_interp, close_interp);
|
|
|
|
int64_t starting_indent = get_indent(ctx->file, pos);
|
|
int64_t string_indent = starting_indent + 1;
|
|
|
|
ast_list_t *chunks = NULL;
|
|
CORD chunk = CORD_EMPTY;
|
|
const char *chunk_start = pos;
|
|
int depth = 1;
|
|
bool leading_newline = false;
|
|
for (; pos < ctx->file->text + ctx->file->len && depth > 0; ++pos) {
|
|
if (*pos == open_interp) {
|
|
if (chunk) {
|
|
ast_t *literal = NewAST(ctx->file, chunk_start, pos, StringLiteral, .cord=chunk);
|
|
chunks = new(ast_list_t, .ast=literal, .next=chunks);
|
|
chunk = NULL;
|
|
}
|
|
++pos;
|
|
for (ast_t *interp; (interp=close_interp ? optional(ctx, &pos, parse_expr) : optional(ctx, &pos, parse_term)); spaces(&pos)) {
|
|
chunks = new(ast_list_t, .ast=interp, .next=chunks);
|
|
chunk_start = pos;
|
|
}
|
|
if (close_interp) {
|
|
const char *closing = pos;
|
|
spaces(&closing);
|
|
if (*closing == close_interp) {
|
|
pos = closing;
|
|
}
|
|
}
|
|
} else if (!leading_newline && *pos == open_quote && closing[(int)open_quote]) {
|
|
if (get_indent(ctx->file, pos) == starting_indent) {
|
|
++depth;
|
|
}
|
|
chunk = CORD_cat_char(chunk, *pos);
|
|
} else if (!leading_newline && *pos == close_quote) {
|
|
if (get_indent(ctx->file, pos) == starting_indent) {
|
|
--depth;
|
|
if (depth == 0)
|
|
break;
|
|
}
|
|
chunk = CORD_cat_char(chunk, *pos);
|
|
} else if (newline_with_indentation(&pos, string_indent)) {
|
|
if (!leading_newline && !(chunk || chunks)) {
|
|
leading_newline = true;
|
|
} else {
|
|
chunk = CORD_cat_char(chunk, '\n');
|
|
}
|
|
--pos;
|
|
} else if (newline_with_indentation(&pos, starting_indent)) {
|
|
if (*pos == close_quote) {
|
|
break;
|
|
} else if (some_of(&pos, ".") >= 2) {
|
|
// Multi-line split
|
|
--pos;
|
|
continue;
|
|
} else {
|
|
parser_err(ctx, pos, strchrnul(pos, '\n'), "This multi-line string should be either indented or have '..' at the front");
|
|
}
|
|
} else {
|
|
chunk = CORD_cat_char(chunk, *pos);
|
|
}
|
|
}
|
|
|
|
if (chunk) {
|
|
ast_t *literal = NewAST(ctx->file, chunk_start, pos, StringLiteral, .cord=chunk);
|
|
chunks = new(ast_list_t, .ast=literal, .next=chunks);
|
|
chunk = NULL;
|
|
}
|
|
|
|
REVERSE_LIST(chunks);
|
|
expect_closing(ctx, &pos, (char[]){close_quote, 0}, "I was expecting a '%c' to finish this string", close_quote);
|
|
return NewAST(ctx->file, start, pos, StringJoin, .children=chunks);
|
|
}
|
|
|
|
PARSER(parse_skip) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "skip")) return NULL;
|
|
spaces(&pos);
|
|
const char* target;
|
|
if (match_word(&pos, "for")) target = "for";
|
|
else if (match_word(&pos, "while")) target = "while";
|
|
else target = get_id(&pos);
|
|
ast_t *skip = NewAST(ctx->file, start, pos, Skip, .target=target);
|
|
return skip;
|
|
}
|
|
|
|
PARSER(parse_stop) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "stop")) return NULL;
|
|
spaces(&pos);
|
|
const char* target;
|
|
if (match_word(&pos, "for")) target = "for";
|
|
else if (match_word(&pos, "while")) target = "while";
|
|
else target = get_id(&pos);
|
|
ast_t *stop = NewAST(ctx->file, start, pos, Stop, .target=target);
|
|
return stop;
|
|
}
|
|
|
|
PARSER(parse_return) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "return")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *value = optional(ctx, &pos, parse_expr);
|
|
ast_t *ret = NewAST(ctx->file, start, pos, Return, .value=value);
|
|
return ret;
|
|
}
|
|
|
|
PARSER(parse_lambda) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "func"))
|
|
return NULL;
|
|
spaces(&pos);
|
|
if (!match(&pos, "("))
|
|
return NULL;
|
|
arg_ast_t *args = parse_args(ctx, &pos, false);
|
|
spaces(&pos);
|
|
expect_closing(ctx, &pos, ")", "I was expecting a ')' to finish this anonymous function's arguments");
|
|
ast_t *body = optional(ctx, &pos, parse_opt_indented_block);
|
|
return NewAST(ctx->file, start, pos, Lambda, .args=args, .body=body);
|
|
}
|
|
|
|
PARSER(parse_nil) {
|
|
const char *start = pos;
|
|
if (!match(&pos, "!")) return NULL;
|
|
type_ast_t *type = parse_type(ctx, pos);
|
|
if (!type) return NULL;
|
|
return NewAST(ctx->file, start, type->end, Nil, .type=type);
|
|
}
|
|
|
|
PARSER(parse_var) {
|
|
const char *start = pos;
|
|
const char* name = get_id(&pos);
|
|
if (!name) return NULL;
|
|
return NewAST(ctx->file, start, pos, Var, .name=name);
|
|
}
|
|
|
|
PARSER(parse_term_no_suffix) {
|
|
spaces(&pos);
|
|
ast_t *term = NULL;
|
|
(void)(
|
|
false
|
|
|| (term=parse_nil(ctx, pos))
|
|
|| (term=parse_num(ctx, pos))
|
|
|| (term=parse_int(ctx, pos))
|
|
|| (term=parse_negative(ctx, pos))
|
|
|| (term=parse_heap_alloc(ctx, pos))
|
|
|| (term=parse_stack_reference(ctx, pos))
|
|
|| (term=parse_bool(ctx, pos))
|
|
|| (term=parse_string(ctx, pos))
|
|
|| (term=parse_lambda(ctx, pos))
|
|
|| (term=parse_parens(ctx, pos))
|
|
|| (term=parse_table(ctx, pos))
|
|
|| (term=parse_var(ctx, pos))
|
|
|| (term=parse_array(ctx, pos))
|
|
|| (term=parse_reduction(ctx, pos))
|
|
|| (term=parse_skip(ctx, pos))
|
|
|| (term=parse_stop(ctx, pos))
|
|
|| (term=parse_return(ctx, pos))
|
|
|| (term=parse_not(ctx, pos))
|
|
|| (term=parse_extern(ctx, pos))
|
|
);
|
|
return term;
|
|
}
|
|
|
|
PARSER(parse_term) {
|
|
ast_t *term = parse_term_no_suffix(ctx, pos);
|
|
if (!term) return NULL;
|
|
|
|
for (bool progress = true; progress; ) {
|
|
ast_t *new_term;
|
|
progress = (false
|
|
|| (new_term=parse_index_suffix(ctx, term))
|
|
|| (new_term=parse_field_suffix(ctx, term))
|
|
|| (new_term=parse_fncall_suffix(ctx, term, NORMAL_FUNCTION))
|
|
);
|
|
if (progress) term = new_term;
|
|
}
|
|
return term;
|
|
}
|
|
|
|
ast_t *parse_fncall_suffix(parse_ctx_t *ctx, ast_t *fn, bool is_extern) {
|
|
if (!fn) return NULL;
|
|
|
|
const char *start = fn->start;
|
|
const char *pos = fn->end;
|
|
|
|
if (!match(&pos, "(")) return NULL;
|
|
|
|
whitespace(&pos);
|
|
|
|
ast_list_t *args = NULL;
|
|
for (;;) {
|
|
const char *arg_start = pos;
|
|
const char *name = get_id(&pos);
|
|
whitespace(&pos);
|
|
if (name) {
|
|
if (match(&pos, "=")) {
|
|
whitespace(&pos);
|
|
ast_t *arg = parse_expr(ctx, pos);
|
|
if (!arg) parser_err(ctx, arg_start, pos, "I couldn't parse this keyword argument value");
|
|
ast_t *kwarg = NewAST(ctx->file, arg_start, arg->end, KeywordArg,
|
|
.name=name, .arg=arg);
|
|
args = new(ast_list_t, .ast=kwarg, .next=args);
|
|
pos = kwarg->end;
|
|
goto got_arg;
|
|
}
|
|
pos = arg_start;
|
|
}
|
|
|
|
ast_t *arg = optional(ctx, &pos, parse_expr);
|
|
if (!arg) break;
|
|
args = new(ast_list_t, .ast=arg, .next=args);
|
|
|
|
got_arg:;
|
|
|
|
whitespace(&pos);
|
|
if (!match(&pos, ","))
|
|
break;
|
|
whitespace(&pos);
|
|
}
|
|
|
|
whitespace(&pos);
|
|
|
|
if (!match(&pos, ")"))
|
|
parser_err(ctx, start, pos, "This parenthesis is unclosed");
|
|
|
|
type_ast_t *extern_return_type = NULL;
|
|
if (is_extern) {
|
|
if (match(&pos, ":"))
|
|
extern_return_type = expect(ctx, start, &pos, parse_type, "I couldn't parse the return type of this external function call");
|
|
else
|
|
extern_return_type = NewTypeAST(ctx->file, pos, pos, VarTypeAST, .name="Void");
|
|
}
|
|
REVERSE_LIST(args);
|
|
return NewAST(ctx->file, start, pos, FunctionCall, .fn=fn, .args=args, .extern_return_type=extern_return_type);
|
|
}
|
|
|
|
binop_e match_binary_operator(const char **pos)
|
|
{
|
|
switch (**pos) {
|
|
case '+': {
|
|
*pos += 1;
|
|
return match(pos, "+") ? BINOP_CONCAT : BINOP_PLUS;
|
|
}
|
|
case '-': {
|
|
*pos += 1;
|
|
if ((*pos)[0] != ' ' && (*pos)[-2] == ' ') // looks like `fn -5`
|
|
return BINOP_UNKNOWN;
|
|
return BINOP_MINUS;
|
|
}
|
|
case '*': *pos += 1; return BINOP_MULT;
|
|
case '/': *pos += 1; return BINOP_DIVIDE;
|
|
case '^': *pos += 1; return BINOP_POWER;
|
|
case '<': *pos += 1; return match(pos, "=") ? BINOP_LE : (match(pos, "<") ? BINOP_LSHIFT : BINOP_LT);
|
|
case '>': *pos += 1; return match(pos, "=") ? BINOP_GE : (match(pos, ">") ? BINOP_RSHIFT : BINOP_GT);
|
|
default: {
|
|
if (match(pos, "!=")) return BINOP_NE;
|
|
else if (match(pos, "==") && **pos != '=') return BINOP_EQ;
|
|
else if (match_word(pos, "and")) return BINOP_AND;
|
|
else if (match_word(pos, "or")) return BINOP_OR;
|
|
else if (match_word(pos, "xor")) return BINOP_XOR;
|
|
else if (match_word(pos, "mod1")) return BINOP_MOD1;
|
|
else if (match_word(pos, "mod")) return BINOP_MOD;
|
|
else if (match_word(pos, "_min_")) return BINOP_MIN;
|
|
else if (match_word(pos, "_max_")) return BINOP_MAX;
|
|
else return BINOP_UNKNOWN;
|
|
}
|
|
}
|
|
}
|
|
|
|
static ast_t *parse_infix_expr(parse_ctx_t *ctx, const char *pos, int min_tightness) {
|
|
ast_t *lhs = optional(ctx, &pos, parse_term);
|
|
if (!lhs) return NULL;
|
|
|
|
spaces(&pos);
|
|
binop_e op = match_binary_operator(&pos);
|
|
if (op == BINOP_UNKNOWN || op_tightness[op] < min_tightness)
|
|
return lhs;
|
|
|
|
ast_t *key = NULL;
|
|
if (op == BINOP_MIN || op == BINOP_MAX) {
|
|
key = NewAST(ctx->file, pos, pos, Var, .name=op == BINOP_MIN ? "_min_" : "_max_");
|
|
for (bool progress = true; progress; ) {
|
|
ast_t *new_term;
|
|
progress = (false
|
|
|| (new_term=parse_index_suffix(ctx, key))
|
|
|| (new_term=parse_field_suffix(ctx, key))
|
|
|| (new_term=parse_fncall_suffix(ctx, key, NORMAL_FUNCTION))
|
|
);
|
|
if (progress) key = new_term;
|
|
}
|
|
if (key->tag == Var) key = NULL;
|
|
else pos = key->end;
|
|
|
|
}
|
|
spaces(&pos);
|
|
ast_t *rhs = parse_infix_expr(ctx, pos, op_tightness[op]);
|
|
if (!rhs) return lhs;
|
|
pos = rhs->end;
|
|
|
|
switch (op) {
|
|
case BINOP_MIN:
|
|
return NewAST(ctx->file, lhs->start, rhs->end, Min, .lhs=lhs, .rhs=rhs, .key=key);
|
|
case BINOP_MAX:
|
|
return NewAST(ctx->file, lhs->start, rhs->end, Max, .lhs=lhs, .rhs=rhs, .key=key);
|
|
default:
|
|
return NewAST(ctx->file, lhs->start, rhs->end, BinaryOp, .lhs=lhs, .rhs=rhs, .op=op);
|
|
}
|
|
}
|
|
|
|
ast_t *parse_expr(parse_ctx_t *ctx, const char *pos) {
|
|
return parse_infix_expr(ctx, pos, 0);
|
|
}
|
|
|
|
PARSER(parse_declaration) {
|
|
const char *start = pos;
|
|
ast_t *var = parse_var(ctx, pos);
|
|
if (!var) return NULL;
|
|
pos = var->end;
|
|
spaces(&pos);
|
|
if (!match(&pos, ":=")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *val = optional(ctx, &pos, parse_use);
|
|
if (!val) val = optional(ctx, &pos, parse_extended_expr);
|
|
if (!val) parser_err(ctx, pos, strchrnul(pos, '\n'), "This declaration value didn't parse");
|
|
return NewAST(ctx->file, start, pos, Declare, .var=var, .value=val);
|
|
}
|
|
|
|
PARSER(parse_update) {
|
|
const char *start = pos;
|
|
ast_t *lhs = optional(ctx, &pos, parse_expr);
|
|
if (!lhs) return NULL;
|
|
spaces(&pos);
|
|
binop_e op;
|
|
if (match(&pos, "+=")) op = BINOP_PLUS;
|
|
else if (match(&pos, "++=")) op = BINOP_CONCAT;
|
|
else if (match(&pos, "-=")) op = BINOP_MINUS;
|
|
else if (match(&pos, "*=")) op = BINOP_MULT;
|
|
else if (match(&pos, "/=")) op = BINOP_DIVIDE;
|
|
else if (match(&pos, "and=")) op = BINOP_AND;
|
|
else if (match(&pos, "or=")) op = BINOP_OR;
|
|
else if (match(&pos, "xor=")) op = BINOP_XOR;
|
|
else return NULL;
|
|
ast_t *rhs = expect(ctx, start, &pos, parse_extended_expr, "I expected an expression here");
|
|
return NewAST(ctx->file, start, pos, UpdateAssign, .lhs=lhs, .rhs=rhs, .op=op);
|
|
}
|
|
|
|
PARSER(parse_assignment) {
|
|
const char *start = pos;
|
|
ast_list_t *targets = NULL;
|
|
for (;;) {
|
|
ast_t *lhs = optional(ctx, &pos, parse_term);
|
|
if (!lhs) break;
|
|
targets = new(ast_list_t, .ast=lhs, .next=targets);
|
|
spaces(&pos);
|
|
if (!match(&pos, ",")) break;
|
|
whitespace(&pos);
|
|
}
|
|
|
|
if (!targets) return NULL;
|
|
|
|
spaces(&pos);
|
|
if (!match(&pos, "=")) return NULL;
|
|
if (match(&pos, "=")) return NULL; // == comparison
|
|
|
|
ast_list_t *values = NULL;
|
|
for (;;) {
|
|
ast_t *rhs = optional(ctx, &pos, parse_extended_expr);
|
|
if (!rhs) break;
|
|
values = new(ast_list_t, .ast=rhs, .next=values);
|
|
spaces(&pos);
|
|
if (!match(&pos, ",")) break;
|
|
whitespace(&pos);
|
|
}
|
|
|
|
REVERSE_LIST(targets);
|
|
REVERSE_LIST(values);
|
|
|
|
return NewAST(ctx->file, start, pos, Assign, .targets=targets, .values=values);
|
|
}
|
|
|
|
PARSER(parse_statement) {
|
|
ast_t *stmt = NULL;
|
|
if ((stmt=parse_declaration(ctx, pos))
|
|
|| (stmt=parse_doctest(ctx, pos))
|
|
|| (stmt=parse_func_def(ctx, pos))
|
|
|| (stmt=parse_use(ctx,pos)))
|
|
return stmt;
|
|
|
|
if (!(false
|
|
|| (stmt=parse_update(ctx, pos))
|
|
|| (stmt=parse_assignment(ctx, pos))
|
|
))
|
|
stmt = parse_extended_expr(ctx, pos);
|
|
|
|
for (bool progress = (stmt != NULL); progress; ) {
|
|
ast_t *new_stmt;
|
|
progress = false;
|
|
if (stmt->tag == Var)
|
|
progress = (new_stmt=parse_fncall_suffix(ctx, stmt, NORMAL_FUNCTION));
|
|
|
|
if (progress) stmt = new_stmt;
|
|
}
|
|
return stmt;
|
|
|
|
}
|
|
|
|
PARSER(parse_extended_expr) {
|
|
ast_t *expr = NULL;
|
|
|
|
if (false
|
|
|| (expr=optional(ctx, &pos, parse_for))
|
|
|| (expr=optional(ctx, &pos, parse_while))
|
|
|| (expr=optional(ctx, &pos, parse_if))
|
|
)
|
|
return expr;
|
|
|
|
return parse_expr(ctx, pos);
|
|
}
|
|
|
|
PARSER(parse_block) {
|
|
int64_t block_indent = get_indent(ctx->file, pos);
|
|
const char *start = pos;
|
|
whitespace(&pos);
|
|
ast_list_t *statements = NULL;
|
|
while (*pos) {
|
|
ast_t *stmt = optional(ctx, &pos, parse_statement);
|
|
if (!stmt) {
|
|
spaces(&pos);
|
|
if (*pos && *pos != '\r' && *pos != '\n')
|
|
parser_err(ctx, pos, strchrnul(pos, '\n'), "I couldn't parse this line");
|
|
break;
|
|
}
|
|
statements = new(ast_list_t, .ast=stmt, .next=statements);
|
|
whitespace(&pos);
|
|
if (get_indent(ctx->file, pos) != block_indent) {
|
|
pos = stmt->end; // backtrack
|
|
break;
|
|
}
|
|
}
|
|
REVERSE_LIST(statements);
|
|
return NewAST(ctx->file, start, pos, Block, .statements=statements);
|
|
}
|
|
|
|
PARSER(parse_opt_indented_block) {
|
|
return indent(ctx, &pos) ? parse_block(ctx, pos) : parse_inline_block(ctx, pos);
|
|
}
|
|
|
|
PARSER(parse_namespace) {
|
|
const char *start = pos;
|
|
whitespace(&pos);
|
|
int64_t indent = get_indent(ctx->file, pos);
|
|
ast_list_t *statements = NULL;
|
|
for (;;) {
|
|
const char *next = pos;
|
|
whitespace(&next);
|
|
if (get_indent(ctx->file, next) != indent) break;
|
|
ast_t *stmt;
|
|
if ((stmt=optional(ctx, &pos, parse_struct_def))
|
|
||(stmt=optional(ctx, &pos, parse_enum_def))
|
|
||(stmt=optional(ctx, &pos, parse_linker))
|
|
||(stmt=optional(ctx, &pos, parse_statement)))
|
|
{
|
|
statements = new(ast_list_t, .ast=stmt, .next=statements);
|
|
pos = stmt->end;
|
|
whitespace(&pos);
|
|
} else {
|
|
if (get_indent(ctx->file, next) > indent && next < strchrnul(next, '\n'))
|
|
parser_err(ctx, next, strchrnul(next, '\n'), "I couldn't parse this namespace statement");
|
|
break;
|
|
}
|
|
}
|
|
REVERSE_LIST(statements);
|
|
return NewAST(ctx->file, start, pos, Block, .statements=statements);
|
|
}
|
|
|
|
PARSER(parse_struct_def) {
|
|
// struct Foo(...) \n body
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "struct")) return NULL;
|
|
|
|
int64_t starting_indent = get_indent(ctx->file, pos);
|
|
|
|
spaces(&pos);
|
|
const char *name = get_id(&pos);
|
|
if (!name) parser_err(ctx, start, pos, "I expected a name for this struct");
|
|
spaces(&pos);
|
|
|
|
if (!match(&pos, "("))
|
|
parser_err(ctx, pos, pos, "I expected a '(' and a list of fields here");
|
|
|
|
arg_ast_t *fields = parse_args(ctx, &pos, false);
|
|
|
|
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this struct");
|
|
|
|
const char *ns_pos = pos;
|
|
whitespace(&ns_pos);
|
|
int64_t ns_indent = get_indent(ctx->file, ns_pos);
|
|
ast_t *namespace = NULL;
|
|
if (ns_indent > starting_indent) {
|
|
pos = ns_pos;
|
|
namespace = optional(ctx, &pos, parse_namespace);
|
|
}
|
|
if (!namespace)
|
|
namespace = NewAST(ctx->file, pos, pos, Block, .statements=NULL);
|
|
return NewAST(ctx->file, start, pos, StructDef, .name=name, .fields=fields, .namespace=namespace);
|
|
}
|
|
|
|
ast_t *parse_enum_def(parse_ctx_t *ctx, const char *pos) {
|
|
// tagged union: enum Foo(a|b(x:Int,y:Int)=5|...) \n namespace
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "enum")) return NULL;
|
|
int64_t starting_indent = get_indent(ctx->file, pos);
|
|
spaces(&pos);
|
|
const char *name = get_id(&pos);
|
|
if (!name)
|
|
parser_err(ctx, start, pos, "I expected a name for this enum");
|
|
spaces(&pos);
|
|
if (!match(&pos, "(")) return NULL;
|
|
|
|
tag_ast_t *tags = NULL;
|
|
int64_t next_value = 0;
|
|
|
|
whitespace(&pos);
|
|
for (;;) {
|
|
const char *tag_start = pos;
|
|
|
|
spaces(&pos);
|
|
const char *tag_name = get_id(&pos);
|
|
if (!tag_name) break;
|
|
|
|
spaces(&pos);
|
|
arg_ast_t *fields;
|
|
if (match(&pos, "(")) {
|
|
whitespace(&pos);
|
|
fields = parse_args(ctx, &pos, false);
|
|
whitespace(&pos);
|
|
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this tagged union member");
|
|
} else {
|
|
fields = NULL;
|
|
}
|
|
|
|
spaces(&pos);
|
|
if (match(&pos, "=")) {
|
|
ast_t *val = expect(ctx, tag_start, &pos, parse_int, "I expected an integer literal after this '='");
|
|
next_value = Match(val, Int)->i;
|
|
}
|
|
|
|
// Check for duplicate values:
|
|
for (tag_ast_t *t = tags; t; t = t->next) {
|
|
if (t->value == next_value)
|
|
parser_err(ctx, tag_start, pos, "This tag value (%ld) is a duplicate of an earlier tag value", next_value);
|
|
}
|
|
|
|
tags = new(tag_ast_t, .name=tag_name, .value=next_value, .fields=fields, .next=tags);
|
|
|
|
const char *next_pos = pos;
|
|
whitespace(&next_pos);
|
|
if (!match(&next_pos, ","))
|
|
break;
|
|
whitespace(&next_pos);
|
|
pos = next_pos;
|
|
++next_value;
|
|
}
|
|
|
|
whitespace(&pos);
|
|
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this enum definition");
|
|
|
|
REVERSE_LIST(tags);
|
|
|
|
const char *ns_pos = pos;
|
|
whitespace(&ns_pos);
|
|
int64_t ns_indent = get_indent(ctx->file, ns_pos);
|
|
ast_t *namespace = NULL;
|
|
if (ns_indent > starting_indent) {
|
|
pos = ns_pos;
|
|
namespace = optional(ctx, &pos, parse_namespace);
|
|
}
|
|
if (!namespace)
|
|
namespace = NewAST(ctx->file, pos, pos, Block, .statements=NULL);
|
|
|
|
return NewAST(ctx->file, start, pos, EnumDef, .name=name, .tags=tags, .namespace=namespace);
|
|
}
|
|
|
|
arg_ast_t *parse_args(parse_ctx_t *ctx, const char **pos, bool allow_unnamed)
|
|
{
|
|
arg_ast_t *args = NULL;
|
|
for (;;) {
|
|
const char *batch_start = *pos;
|
|
ast_t *default_val = NULL;
|
|
type_ast_t *type = NULL;
|
|
|
|
typedef struct name_list_s {
|
|
const char *name;
|
|
struct name_list_s *next;
|
|
} name_list_t;
|
|
|
|
name_list_t *names = NULL;
|
|
for (;;) {
|
|
whitespace(pos);
|
|
const char *name_start = *pos;
|
|
const char *name = get_id(pos);
|
|
if (!name) break;
|
|
whitespace(pos);
|
|
if (strncmp(*pos, "==", 2) != 0 && match(pos, "=")) {
|
|
default_val = expect(ctx, *pos-1, pos, parse_term, "I expected a value after this '='");
|
|
names = new(name_list_t, .name=name, .next=names);
|
|
break;
|
|
} else if (match(pos, ":")) {
|
|
type = expect(ctx, *pos-1, pos, parse_type, "I expected a type here");
|
|
names = new(name_list_t, .name=name, .next=names);
|
|
break;
|
|
} else if (allow_unnamed) {
|
|
*pos = name_start;
|
|
type = optional(ctx, pos, parse_type);
|
|
if (type)
|
|
names = new(name_list_t, .name=NULL, .next=names);
|
|
break;
|
|
} else if (name) {
|
|
names = new(name_list_t, .name=name, .next=names);
|
|
spaces(pos);
|
|
if (!match(pos, ",")) break;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (!names) break;
|
|
if (!default_val && !type)
|
|
parser_err(ctx, batch_start, *pos, "I expected a ':' and type, or '=' and a default value after this parameter (%s)",
|
|
names->name);
|
|
|
|
REVERSE_LIST(names);
|
|
for (; names; names = names->next)
|
|
args = new(arg_ast_t, .name=names->name, .type=type, .default_val=default_val, .next=args);
|
|
whitespace(pos);
|
|
match(pos, ",");
|
|
}
|
|
|
|
REVERSE_LIST(args);
|
|
return args;
|
|
}
|
|
|
|
PARSER(parse_func_def) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "func")) return NULL;
|
|
|
|
ast_t *name = optional(ctx, &pos, parse_var);
|
|
if (!name) return NULL;
|
|
|
|
spaces(&pos);
|
|
|
|
if (!match(&pos, "(")) return NULL;
|
|
|
|
arg_ast_t *args = parse_args(ctx, &pos, false);
|
|
whitespace(&pos);
|
|
bool is_inline = false;
|
|
ast_t *cache_ast = NULL;
|
|
for (; whitespace(&pos), (match(&pos, ";") || match(&pos, ",")); ) {
|
|
const char *flag_start = pos;
|
|
if (match_word(&pos, "inline")) {
|
|
is_inline = true;
|
|
} else if (match_word(&pos, "cached")) {
|
|
if (!cache_ast) cache_ast = NewAST(ctx->file, pos, pos, Int, .i=INT64_MAX, .precision=64);
|
|
} else if (match_word(&pos, "cache_size")) {
|
|
if (whitespace(&pos), !match(&pos, "="))
|
|
parser_err(ctx, flag_start, pos, "I expected a value for 'cache_size'");
|
|
whitespace(&pos);
|
|
cache_ast = expect(ctx, start, &pos, parse_expr, "I expected a maximum size for the cache");
|
|
}
|
|
}
|
|
expect_closing(ctx, &pos, ")", "I wasn't able to parse the rest of this function definition");
|
|
|
|
type_ast_t *ret_type = NULL;
|
|
spaces(&pos);
|
|
if (match(&pos, "->") || match(&pos, ":"))
|
|
ret_type = optional(ctx, &pos, parse_type);
|
|
|
|
ast_t *body = expect(ctx, start, &pos, parse_opt_indented_block,
|
|
"This function needs a body block");
|
|
return NewAST(ctx->file, start, pos, FunctionDef,
|
|
.name=name, .args=args, .ret_type=ret_type, .body=body, .cache=cache_ast,
|
|
.is_inline=is_inline);
|
|
}
|
|
|
|
PARSER(parse_extern) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "extern")) return NULL;
|
|
spaces(&pos);
|
|
bool address = (match(&pos, "&") != 0);
|
|
const char* name = get_id(&pos);
|
|
spaces(&pos);
|
|
// extern function call:
|
|
if (match(&pos, "(")) {
|
|
return parse_fncall_suffix(ctx, NewAST(ctx->file, start, pos-1, Var, .name=name), EXTERN_FUNCTION);
|
|
}
|
|
if (!match(&pos, ":"))
|
|
parser_err(ctx, start, pos, "I couldn't get a type for this extern");
|
|
type_ast_t *type = expect(ctx, start, &pos, parse_type, "I couldn't parse the type for this extern");
|
|
return NewAST(ctx->file, start, pos, Extern, .name=name, .type=type, .address=address);
|
|
}
|
|
|
|
PARSER(parse_doctest) {
|
|
const char *start = pos;
|
|
if (!match(&pos, ">>>")) return NULL;
|
|
spaces(&pos);
|
|
ast_t *expr = expect(ctx, start, &pos, parse_statement, "I couldn't parse the expression for this doctest");
|
|
whitespace(&pos);
|
|
const char* output = NULL;
|
|
if (match(&pos, "===")) {
|
|
spaces(&pos);
|
|
const char *output_start = pos,
|
|
*output_end = strchrnul(pos, '\n');
|
|
if (output_end <= output_start)
|
|
parser_err(ctx, output_start, output_end, "You're missing expected output here");
|
|
output = heap_strn(output_start, (size_t)(output_end - output_start));
|
|
pos = output_end;
|
|
}
|
|
return NewAST(ctx->file, start, pos, DocTest, .expr=expr, .output=output);
|
|
}
|
|
|
|
PARSER(parse_use) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "use")) return NULL;
|
|
spaces(&pos);
|
|
size_t path_len = strcspn(pos, " \t\r\n;");
|
|
if (path_len < 1)
|
|
parser_err(ctx, start, pos, "There is no filename here to use");
|
|
char *path = heap_strf("%.*s.nl", (int)path_len, pos);
|
|
pos += path_len;
|
|
char *resolved_path = resolve_path(path, ctx->file->filename, getenv("USE_PATH"));
|
|
if (!resolved_path)
|
|
parser_err(ctx, start, pos, "No such file exists: \"%s\"", path);
|
|
while (match(&pos, ";")) continue;
|
|
return NewAST(ctx->file, start, pos, Use, .path=resolved_path);
|
|
}
|
|
|
|
PARSER(parse_linker) {
|
|
const char *start = pos;
|
|
if (!match_word(&pos, "!link")) return NULL;
|
|
spaces(&pos);
|
|
size_t len = strcspn(pos, "\r\n");
|
|
const char *directive = heap_strn(pos, len);
|
|
return NewAST(ctx->file, start, pos, LinkerDirective, .directive=directive);
|
|
}
|
|
|
|
PARSER(parse_inline_block) {
|
|
spaces(&pos);
|
|
const char *start = pos;
|
|
ast_list_t *statements = NULL;
|
|
while (*pos) {
|
|
spaces(&pos);
|
|
ast_t *stmt = optional(ctx, &pos, parse_statement);
|
|
if (!stmt) break;
|
|
statements = new(ast_list_t, .ast=stmt, .next=statements);
|
|
spaces(&pos);
|
|
if (!match(&pos, ";")) break;
|
|
}
|
|
REVERSE_LIST(statements);
|
|
return NewAST(ctx->file, start, pos, Block, .statements=statements);
|
|
}
|
|
|
|
ast_t *parse_file(file_t *file, jmp_buf *on_err) {
|
|
parse_ctx_t ctx = {
|
|
.file=file,
|
|
.on_err=on_err,
|
|
};
|
|
|
|
const char *pos = file->text;
|
|
if (match(&pos, "#!")) // shebang
|
|
some_not(&pos, "\r\n");
|
|
|
|
whitespace(&pos);
|
|
ast_t *ast = parse_namespace(&ctx, pos);
|
|
pos = ast->end;
|
|
whitespace(&pos);
|
|
if (pos < file->text + file->len) {
|
|
parser_err(&ctx, pos, pos + strlen(pos), "I couldn't parse this part of the file %zu");
|
|
}
|
|
return ast;
|
|
}
|
|
|
|
type_ast_t *parse_type_str(const char *str) {
|
|
file_t *file = spoof_file("<type>", str);
|
|
parse_ctx_t ctx = {
|
|
.file=file,
|
|
.on_err=NULL,
|
|
};
|
|
|
|
const char *pos = file->text;
|
|
whitespace(&pos);
|
|
type_ast_t *ast = parse_type(&ctx, pos);
|
|
if (!ast) return ast;
|
|
pos = ast->end;
|
|
whitespace(&pos);
|
|
if (strlen(pos) > 0) {
|
|
parser_err(&ctx, pos, pos + strlen(pos), "I couldn't parse this part of the type");
|
|
}
|
|
return ast;
|
|
}
|
|
|
|
ast_t *parse_expression_str(const char *str) {
|
|
file_t *file = spoof_file("<expression>", str);
|
|
parse_ctx_t ctx = {
|
|
.file=file,
|
|
.on_err=NULL,
|
|
};
|
|
|
|
const char *pos = file->text;
|
|
whitespace(&pos);
|
|
ast_t *ast = parse_extended_expr(&ctx, pos);
|
|
if (!ast) return ast;
|
|
pos = ast->end;
|
|
whitespace(&pos);
|
|
if (strlen(pos) > 0) {
|
|
parser_err(&ctx, pos, pos + strlen(pos), "I couldn't parse this part of the expression");
|
|
}
|
|
return ast;
|
|
}
|
|
|
|
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
|