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// Logic for parsing text literals
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include "../unistr-fixed.h"
#include <unictype.h>
#include <uniname.h>
#include "../ast.h"
#include "../stdlib/text.h"
#include "../stdlib/util.h"
#include "context.h"
#include "errors.h"
#include "expressions.h"
#include "types.h"
#include "utils.h"
static const char closing[128] = {['('] = ')', ['['] = ']', ['<'] = '>', ['{'] = '}'};
static ast_list_t *_parse_text_helper(parse_ctx_t *ctx, const char **out_pos, char open_quote, char close_quote,
char open_interp, bool allow_escapes) {
const char *pos = *out_pos;
int64_t starting_indent = get_indent(ctx, pos);
int64_t string_indent = starting_indent + SPACES_PER_INDENT;
ast_list_t *chunks = NULL;
Text_t chunk = EMPTY_TEXT;
const char *chunk_start = pos;
int depth = 1;
bool leading_newline = false;
int64_t plain_span_len = 0;
#define FLUSH_PLAIN_SPAN() \
do { \
if (plain_span_len > 0) { \
chunk = Texts(chunk, Text$from_strn(pos - plain_span_len, (size_t)plain_span_len)); \
plain_span_len = 0; \
} \
} while (0)
for (const char *end = ctx->file->text + ctx->file->len; pos < end && depth > 0;) {
const char *after_indentation = pos;
if (*pos == open_interp) { // Interpolation
FLUSH_PLAIN_SPAN();
const char *interp_start = pos;
if (chunk.length > 0) {
ast_t *literal = NewAST(ctx->file, chunk_start, pos, TextLiteral, .text = chunk);
chunks = new (ast_list_t, .ast = literal, .next = chunks);
chunk = EMPTY_TEXT;
}
++pos;
ast_t *interp;
if (*pos == ' ' || *pos == '\t')
parser_err(ctx, pos, pos + 1, "Whitespace is not allowed before an interpolation here");
interp = expect(ctx, interp_start, &pos, parse_term_no_suffix, "I expected an interpolation term here");
chunks = new (ast_list_t, .ast = interp, .next = chunks);
chunk_start = pos;
} else if (allow_escapes && *pos == '\\') {
FLUSH_PLAIN_SPAN();
const char *c = unescape(ctx, &pos);
chunk = Texts(chunk, Text$from_str(c));
} else if (!leading_newline && *pos == open_quote && closing[(int)open_quote]) { // Nested pair begin
if (get_indent(ctx, pos) == starting_indent) {
++depth;
}
plain_span_len += 1;
++pos;
} else if (!leading_newline && *pos == close_quote) { // Nested pair end
if (get_indent(ctx, pos) == starting_indent) {
--depth;
if (depth == 0) break;
}
plain_span_len += 1;
++pos;
} else if (newline_with_indentation(&after_indentation, string_indent)) { // Newline
FLUSH_PLAIN_SPAN();
pos = after_indentation;
if (!leading_newline && !(chunk.length > 0 || chunks)) {
leading_newline = true;
} else {
chunk = Texts(chunk, Text("\n"));
}
} else if (newline_with_indentation(&after_indentation, starting_indent)) { // Line continuation (..)
FLUSH_PLAIN_SPAN();
pos = after_indentation;
if (*pos == close_quote) {
break;
} else if (some_of(&pos, ".") >= 2) {
// Multi-line split
continue;
} else {
parser_err(ctx, pos, eol(pos),
"This multi-line string should be either indented or have '..' at the front");
}
} else { // Plain character
ucs4_t codepoint;
const char *next = (const char *)u8_next(&codepoint, (const uint8_t *)pos);
plain_span_len += (int64_t)(next - pos);
if (next == NULL) break;
pos = next;
}
}
FLUSH_PLAIN_SPAN();
#undef FLUSH_PLAIN_SPAN
if (chunk.length > 0) {
ast_t *literal = NewAST(ctx->file, chunk_start, pos, TextLiteral, .text = chunk);
chunks = new (ast_list_t, .ast = literal, .next = chunks);
chunk = EMPTY_TEXT;
}
REVERSE_LIST(chunks);
char close_str[2] = {close_quote, 0};
expect_closing(ctx, &pos, close_str, "I was expecting a ", close_quote, " to finish this string");
*out_pos = pos;
return chunks;
}
ast_t *parse_text(parse_ctx_t *ctx, const char *pos) {
// ('"' ... '"' / "'" ... "'" / "`" ... "`")
// "$" [name] [interp-char] quote-char ... close-quote
const char *start = pos;
const char *lang = NULL;
char open_quote, close_quote, open_interp = '$';
if (match(&pos, "\"")) { // Double quote
open_quote = '"', close_quote = '"', open_interp = '$';
} else if (match(&pos, "`")) { // Backtick
open_quote = '`', close_quote = '`', open_interp = '$';
} else if (match(&pos, "'")) { // Single quote
open_quote = '\'', close_quote = '\'', open_interp = '$';
} else if (match(&pos, "$")) { // Customized strings
lang = get_id(&pos);
// $"..." or $@"...."
static const char *interp_chars = "~!@#$%^&*+=\\?";
if (match(&pos, "$")) { // Disable interpolation with $$
open_interp = '\x03';
} else if (strchr(interp_chars, *pos)) {
open_interp = *pos;
++pos;
}
static const char *quote_chars = "\"'`|/;([{<";
if (!strchr(quote_chars, *pos))
parser_err(ctx, pos, pos + 1,
"This is not a valid string quotation character. Valid characters are: \"'`|/;([{<");
open_quote = *pos;
++pos;
close_quote = closing[(int)open_quote] ? closing[(int)open_quote] : open_quote;
} else {
return NULL;
}
bool allow_escapes = (open_quote != '`');
ast_list_t *chunks = _parse_text_helper(ctx, &pos, open_quote, close_quote, open_interp, allow_escapes);
bool colorize = match(&pos, "~") && match_word(&pos, "colorized");
return NewAST(ctx->file, start, pos, TextJoin, .lang = lang, .children = chunks, .colorize = colorize);
}
ast_t *parse_inline_c(parse_ctx_t *ctx, const char *pos) {
const char *start = pos;
if (!match_word(&pos, "C_code")) return NULL;
spaces(&pos);
type_ast_t *type = NULL;
ast_list_t *chunks;
if (match(&pos, ":")) {
type = expect(ctx, start, &pos, parse_type, "I couldn't parse the type for this C_code code");
spaces(&pos);
if (!match(&pos, "(")) parser_err(ctx, start, pos, "I expected a '(' here");
chunks = new (ast_list_t, .ast = NewAST(ctx->file, pos, pos, TextLiteral, Text("({")),
.next = _parse_text_helper(ctx, &pos, '(', ')', '@', false));
if (type) {
REVERSE_LIST(chunks);
chunks = new (ast_list_t, .ast = NewAST(ctx->file, pos, pos, TextLiteral, Text("; })")), .next = chunks);
REVERSE_LIST(chunks);
}
} else {
if (!match(&pos, "{")) parser_err(ctx, start, pos, "I expected a '{' here");
chunks = _parse_text_helper(ctx, &pos, '{', '}', '@', false);
}
return NewAST(ctx->file, start, pos, InlineCCode, .chunks = chunks, .type_ast = type);
}
ast_t *parse_path(parse_ctx_t *ctx, const char *pos) {
// "(" ("~/" / "./" / "../" / "/") ... ")"
const char *start = pos;
if (!match(&pos, "(")) return NULL;
if (!(*pos == '~' || *pos == '.' || *pos == '/')) return NULL;
const char *path_start = pos;
size_t len = 1;
int paren_depth = 1;
while (pos + len < ctx->file->text + ctx->file->len - 1) {
if (pos[len] == '\\') {
len += 2;
continue;
} else if (pos[len] == '(') {
paren_depth += 1;
} else if (pos[len] == ')') {
paren_depth -= 1;
if (paren_depth <= 0) break;
} else if (pos[len] == '\r' || pos[len] == '\n') {
parser_err(ctx, path_start, &pos[len - 1], "This path was not closed");
}
len += 1;
}
pos += len + 1;
char *path = String(string_slice(path_start, .length = len));
for (char *src = path, *dest = path;;) {
if (src[0] == '\\') {
*(dest++) = src[1];
src += 2;
} else if (*src) {
*(dest++) = *(src++);
} else {
*(dest++) = '\0';
break;
}
}
return NewAST(ctx->file, start, pos, Path, .path = path);
}
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