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#include <stdio.h>
#include <stdlib.h>
#include "vendor/mpc.h"
#include "template.h"
char *read_file(char *filename) {
char *input = malloc(BUFSIZ);
unsigned int size = 0;
FILE *f = fopen(filename, "r");
if (!f) {
printf("Could not open \"%s\" for reading", filename);
exit(1);
}
unsigned int read = 0;
while ( (read = fread(input, 1, BUFSIZ, f)) > 0) {
size += read;
input = realloc(input, size + BUFSIZ);
}
fclose(f);
input[size] = '\0';
return input;
}
int eval(char *dest, mpc_ast_t* t, struct hashmap *ctx) {
if (strstr(t->tag, "content|var")) {
char *value = NULL;
// TODO: Optimize this so we can use it for 1..n keys
if (t->children[1]->children_num == 0) {
char *key = t->children[1]->contents;
value = hashmap_get(ctx, key);
} else {
char *key = t->children[1]->children[0]->contents;
ctx = hashmap_get(ctx, key);
if (ctx == NULL) {
// TODO: Handle unexisting keys
return 1;
}
char *subkey = t->children[1]->children[2]->contents;
value = hashmap_get(ctx, subkey);
}
// TODO: Handle unexisting keys
if (value == NULL) {
return 1;
}
strcat(dest, value);
return 0;
}
if (strstr(t->tag, "content|for")) {
char *tmp_key = t->children[2]->contents;
// TODO: Handle dot notation here.
char *iterator_key = t->children[4]->contents;
struct vector *list = hashmap_get(ctx, iterator_key);
for (int i=0; i < list->size; i++) {
hashmap_insert(ctx, tmp_key, list->values[i]);
eval(dest, t->children[6], ctx);
}
return 0;
}
if (strstr(t->tag, "content|text")) {
strcat(dest, t->contents);
return 0;
}
for (int i=0; i < t->children_num; i++) {
eval(dest, t->children[i], ctx);
}
return 0;
}
mpc_parser_t *parser_init() {
mpc_parser_t *Symbol = mpc_new("symbol");
mpc_parser_t *Symbols = mpc_new("symbols");
mpc_parser_t *Text = mpc_new("text");
mpc_parser_t *Var_Open = mpc_new("var_open");
mpc_parser_t *Var_Close = mpc_new("var_close");
mpc_parser_t *Var = mpc_new("var");
mpc_parser_t *Block_Open = mpc_new("block_open");
mpc_parser_t *Block_Close = mpc_new("block_close");
mpc_parser_t *For = mpc_new("for");
mpc_parser_t *Body = mpc_new("body");
mpc_parser_t *Content = mpc_new("content");
mpc_parser_t *Template = mpc_new("template");
mpca_lang(MPCA_LANG_WHITESPACE_SENSITIVE,
" symbol : /[a-zA-Z_]+/ ;"
" symbols : <symbol>\".\"?<symbol>? ;"
" var_open : /\{{2} ?/ ;"
" var_close : / ?}{2}/ ;"
" var : <var_open> <symbols> <var_close> ;"
" block_open: /\{\% ?/ ;"
" block_close: / ?\%}/ ;"
" for : <block_open> \"for \" <symbol> \" in \" <symbols> <block_close> <body> <block_open> \"endfor\" <block_close> ;"
" text : /[^{][^{%]*/ ;"
" content : <var> | <for> | <text>;"
" body : <content>* ;"
" template : /^/ <body> /$/ ;",
Symbol, Symbols, Var_Open, Var_Close, Var, Block_Open, Block_Close, For, Text, Content, Body, Template, NULL);
return Template;
}
char *template(char *tmpl, struct hashmap *ctx) {
mpc_parser_t *parser = parser_init();
mpc_result_t r;
if (!mpc_parse("input", tmpl, parser, &r)) {
mpc_err_print(r.error);
mpc_err_delete(r.error);
return NULL;
}
printf("Template: %s\n", tmpl);
printf("AST: ");
mpc_ast_print(r.output);
printf("\n");
// FIXME: Allocate precisely
char *output = malloc(strlen(tmpl) * 2);
output[0] = '\0';
eval(output, r.output, ctx);
mpc_ast_delete(r.output);
return output;
}
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