Renamed matchviz -> explain

1 files changed, 0 insertions, 172 deletions

diff --git a/matchviz.c b/matchviz.c
deleted file mode 100644
index 720ff94..0000000
--- a/matchviz.c
+++ /dev/null
@@ -1,172 +0,0 @@
-//
-// debugviz.c - Debug visualization of pattern matches.
-//
-
-#include <stdio.h>
-#include <string.h>
-
-#include "matchviz.h"
-#include "types.h"
-#include "utils.h"
-
-typedef struct match_node_s {
-    match_t *m;
-    struct match_node_s *next;
-} match_node_t;
-
-__attribute__((nonnull, pure))
-static int height_of_match(match_t *m);
-__attribute__((nonnull))
-static void _visualize_matches(match_node_t *firstmatch, int depth, const char *text, size_t textlen);
-
-//
-// Return the height of a match object (i.e. the number of descendents of the
-// structure).
-//
-static int height_of_match(match_t *m)
-{
-    int height = 0;
-    for (int i = 0; m->children && m->children[i]; i++) {
-        match_t *child = m->children[i];
-        int childheight = height_of_match(child);
-        if (childheight > height) height = childheight;
-    }
-    return 1 + height;
-}
-
-//
-// Print a visual explanation for the as-yet-unprinted matches provided.
-//
-static void _visualize_matches(match_node_t *firstmatch, int depth, const char *text, size_t textlen)
-{
-    const char *V = "│"; // Vertical bar
-    const char *H = "─"; // Horizontal bar
-    const char *color = (depth % 2 == 0) ? "34" : "33";
-
-    match_t *viz = firstmatch->m;
-    // This is a heuristic: print matches first if they have more submatches.
-    // In general, this helps reduce the height of the final output by allowing
-    // for more rows that show the same rule matching in multiple places.
-    // TODO: there may be a better heuristic that optimizes for this factor
-    // while also printing earlier matches first when it doesn't affect overall
-    // output height.
-    for (match_node_t *p = firstmatch; p; p = p->next)
-        if (height_of_match(p->m) > height_of_match(viz))
-            viz = p->m;
-    const char *viz_type = viz->pat->start;
-    size_t viz_typelen = (size_t)(viz->pat->end - viz->pat->start);
-
-    // Backrefs use added dim quote marks to indicate that the pattern is a
-    // literal string being matched. (Backrefs have start/end inside the text
-    // input, instead of something the user typed in)
-    if (viz_type >= text && viz_type <= &text[textlen])
-        printf("\033[%luG\033[0;2m\"\033[%s;1m", 2*textlen+3, color);
-    else
-        printf("\033[%luG\033[%s;1m", 2*textlen+3, color);
-
-    for (size_t i = 0; i < viz_typelen; i++) {
-        switch (viz_type[i]) {
-            case '\n': printf("↵"); break;
-            case '\t': printf("⇥"); break;
-            default: printf("%c", viz_type[i]); break;
-        }
-    }
-
-    if (viz_type >= text && viz_type <= &text[textlen])
-        printf("\033[0;2m\"");
-
-    printf("\033[0m");
-
-    match_node_t *children = NULL;
-    match_node_t **nextchild = &children;
-
-#define RIGHT_TYPE(m) (m->m->pat->end == m->m->pat->start + viz_typelen && strncmp(m->m->pat->start, viz_type, viz_typelen) == 0)
-    // Print nonzero-width first:
-    for (match_node_t *m = firstmatch; m; m = m->next) {
-        if (RIGHT_TYPE(m)) {
-            for (int i = 0; m->m->children && m->m->children[i]; i++) {
-                *nextchild = new(match_node_t);
-                (*nextchild)->m = m->m->children[i];
-                nextchild = &((*nextchild)->next);
-            }
-            if (m->m->end == m->m->start) continue;
-            printf("\033[%ldG\033[0;2m%s\033[0;7;%sm", 1+2*(m->m->start - text), V, color);
-            for (const char *c = m->m->start; c < m->m->end; ++c) {
-                // TODO: newline
-                if (c > m->m->start) printf(" ");
-                // TODO: utf8
-                //while ((*c & 0xC0) != 0x80) printf("%c", *(c++));
-                if (*c == '\n')
-                    printf("↵");
-                else if (*c == '\t')
-                    printf("⇥");
-                else
-                    printf("%c", *c);
-            }
-            printf("\033[0;2m%s\033[0m", V);
-        } else {
-            *nextchild = new(match_node_t);
-            (*nextchild)->m = m->m;
-            nextchild = &((*nextchild)->next);
-            printf("\033[%ldG\033[0;2m%s", 1+2*(m->m->start - text), V);
-            for (ssize_t i = (ssize_t)(2*(m->m->end - m->m->start)-1); i > 0; i--)
-                printf(" ");
-            if (m->m->end > m->m->start)
-                printf("\033[0;2m%s", V);
-            printf("\033[0m");
-        }
-    }
-
-    // Print stars for zero-width:
-    for (match_node_t *m = firstmatch; m; m = m->next) {
-        if (m->m->end > m->m->start) continue;
-        if (RIGHT_TYPE(m)) {
-            printf("\033[%ldG\033[7;%sm▒\033[0m", 1+2*(m->m->start - text), color);
-        } else {
-            printf("\033[%ldG\033[0;2m%s\033[0m", 1+2*(m->m->start - text), V);
-        }
-    }
-
-    printf("\n");
-
-    for (match_node_t *m = firstmatch; m; m = m->next) {
-        if (m->m->end == m->m->start) {
-            if (!RIGHT_TYPE(m))
-                printf("\033[%ldG\033[0;2m%s", 1 + 2*(m->m->start - text), V);
-        } else {
-            const char *l = "└";
-            const char *r = "┘";
-            for (match_node_t *c = children; c; c = c->next) {
-                if (c->m->start == m->m->start || c->m->end == m->m->start) l = V;
-                if (c->m->start == m->m->end   || c->m->end == m->m->end) r = V;
-            }
-            printf("\033[%ldG\033[0;2m%s", 1 + 2*(m->m->start - text), l);
-            const char *h = RIGHT_TYPE(m) ? H : " ";
-            for (ssize_t n = (ssize_t)(2*(m->m->end - m->m->start) - 1); n > 0; n--)
-                printf("%s", h);
-            printf("%s\033[0m", r);
-        }
-    }
-#undef RIGHT_TYPE
-
-    printf("\n");
-
-    if (children)
-        _visualize_matches(children, depth+1, text, textlen);
-
-    for (match_node_t *c = children, *next = NULL; c; c = next) {
-        next = c->next;
-        delete(&c);
-    }
-}
-
-//
-// Print a visualization of a match object.
-//
-void visualize_match(match_t *m)
-{
-    printf("\033[?7l"); // Disable line wrapping
-    match_node_t first = {.m = m};
-    _visualize_matches(&first, 0, m->start, (size_t)(m->end - m->start));
-    printf("\033[?7h"); // Re-enable line wrapping
-}