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#include <ctype.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include "lex.h"
#include "typeutils.h"
typedef struct {
char* str;
size_t pos;
} RawLine;
String collect_identifier(RawLine* line) {
String id_buf = make_String(256);
while (line->str[line->pos] == '_' || isalnum(line->str[line->pos])) {
push_to_String(&id_buf, line->str[line->pos++]);
}
return id_buf;
}
String collect_single_quoted_section(RawLine* line) {
line->pos++; // Consume quote mark
String chunk_str = make_String(256);
while (line->str[line->pos] != '\'') {
if (line->str[line->pos] == '\0') exit(42);
push_to_String(&chunk_str, line->str[line->pos++]);
}
line->pos++; // Consume closing quote
return chunk_str;
}
TokenVec lex_region(RawLine* line, char until);
void expect_char(RawLine* line, char expected) {
if (line->str[line->pos] != expected) exit(42); // TODO: nicer handling
line->pos++;
}
MaybeChunk lex_expansion_chunk(RawLine* line, ExpansionRegionVec* reg_arena) {
line->pos++; // Consume $
if (line->str[line->pos] == '(') {
if (line->str[line->pos] == '(') {
TokenVec inner_toks = lex_region(line, ')');
expect_char(line, ')');
expect_char(line, ')');
push_to_ExpansionRegionVec(
reg_arena,
(ExpansionRegion){.mode = ARITHM, .tokens = inner_toks}
);
ExpansionRegion* reg_ptr = ®_arena->items[reg_arena->count]; // TODO: maybe have push() return a pointer [in the macro]
return (MaybeChunk){
.some = true,
.value = (Chunk){
.qmode = DOUBLE_Q,
.kind = REGION_EXP,
.as.reg_ptr = reg_ptr
},
};
} else {
TokenVec inner_toks = lex_region(line, ')');
expect_char(line, ')');
push_to_ExpansionRegionVec(
reg_arena,
(ExpansionRegion){.mode = CMD_SUB, .tokens = inner_toks}
);
ExpansionRegion* reg_ptr = ®_arena->items[reg_arena->count];
return (MaybeChunk) {
.some = true,
.value = (Chunk){
.qmode = DOUBLE_Q,
.kind = REGION_EXP,
.as.reg_ptr = reg_ptr,
}
};
}
} else {
String id_name = collect_identifier(line);
if (id_name.count > 0) {
return (MaybeChunk){
.some = true,
.value = (Chunk){
.qmode = DOUBLE_Q,
.kind = VAR_EXP,
.as.varname = inner(id_name),
}
};
}
}
return (MaybeChunk){.some = false};
}
void lex_double_quoted_section(RawLine* line, ChunkVec* coll, ExpansionRegionVec* reg_arena) {
line->pos++;
String accum = make_String(256);
while (line->str[line->pos] != '\"') {
if (line->str[line->pos] == '\0') exit(42);
MaybeChunk exp_chunk = {.some = false};
if (line->str[line->pos] == '$') {
exp_chunk = lex_expansion_chunk(line, reg_arena);
if (!exp_chunk.some) {
push_to_String(&accum, '$');
}
} else {
push_to_String(&accum, line->str[line->pos++]);
}
// TODO: other special cases beyond $
if (exp_chunk.some) {
if (accum.count > 0) {
push_to_ChunkVec(coll, (Chunk){
.qmode = DOUBLE_Q,
.kind = LITERAL,
.as.literal_str = inner(accum)
});
accum = make_String(256);
}
push_to_ChunkVec(coll, exp_chunk.value);
exp_chunk.some = false;
}
}
if (accum.count > 0) {
push_to_ChunkVec(coll, (Chunk){
.qmode = DOUBLE_Q,
.kind = LITERAL,
.as.literal_str = inner(accum)
});
}
}
Chunk next_chunk_unquoted(RawLine* line, ExpansionRegionVec* reg_arena) {
for (char c; (c=line->str[line->pos], c != '$' && c != '\0' && c != ' '), )
}
typedef struct {
Region root_reg;
RegionVec reg_arena;
} LexResult;
// TODO: maybe make an input+pos struct
TokenVec lex_region(char* input, size_t* pos, char until) {
TokenVec tokens = make_TokenVec(256);
RegionVec reg_arena;
while (input[*pos] != until) {
// Getting a token
if (input[*pos] == ' ') {
(*pos)++;
continue;
}
ChunkVec chunks = make_ChunkVec(256);
switch (input[*pos]) {
case '\'':
String qstring = get_single_quoted_chunk(input, pos);
push_to_ChunkVec(&chunks, (Chunk){.qmode=SINGLE_Q, .kind = LITERAL, .as.literal_str = qstring.items});
break;
}
}
return tokens;
}
TokenVec lex(char* input) {
size_t pos = 0;
return lex_region(input, &pos, '\0');
}
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