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/* See LICENSE file for copyright and license details. */
#include "common.h"
void
push_mode(struct parser_context *ctx, enum tokeniser_mode mode)
{
struct mode_stack *new = emalloc(sizeof(*new));
new->mode = mode;
new->she_is_comment = 1;
new->previous = ctx->mode_stack;
ctx->mode_stack = new;
}
void
pop_mode(struct parser_context *ctx)
{
struct mode_stack *old = ctx->mode_stack;
ctx->mode_stack = ctx->mode_stack->previous;
free(old);
}
size_t
parse_preparsed(struct parser_context *ctx, char *code, size_t code_len)
{
#define IS_SYMBOL(C) ((C) == '<' || (C) == '>' || (C) == '&' || (C) == '|' ||\
(C) == '(' || (C) == ')' || (C) == ';' || (C) == '-')
size_t bytes_read = 0;
size_t token_len;
for (; bytes_read < code_len; bytes_read += token_len, code = &code[token_len]) {
switch (ctx->mode_stack->mode) {
case NORMAL_MODE:
if (*code == '#' && ctx->mode_stack->she_is_comment) {
token_len = 1;
push_mode(ctx, COMMENT_MODE);
} else if (*code == '\n') {
token_len = 1;
ctx->mode_stack->she_is_comment = 1;
push_whitespace(ctx, 0);
push_semicolon(ctx, 1);
ctx->tokeniser_line_number += 1;
if (ctx->here_documents_first)
push_mode(ctx, HERE_DOCUMENT_MODE);
} else if (isspace(*code)) {
ctx->mode_stack->she_is_comment = 1;
push_whitespace(ctx, 0);
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1)
if (!isspace(code[token_len]) || code[token_len] == '\n')
break;
} else if (*code == ')' && ctx->mode_stack->previous) {
token_len = 1;
ctx->mode_stack->she_is_comment = 1;
pop_mode(ctx);
push_leave(ctx);
} else if (IS_SYMBOL(*code)) {
ctx->mode_stack->she_is_comment = 1;
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1)
if (!IS_SYMBOL(code[token_len]))
goto symbol_end;
if (!ctx->end_of_file_reached)
goto need_more;
symbol_end:
token_len = push_symbol(ctx, code, token_len);
} else if (*code == '\\') {
ctx->mode_stack->she_is_comment = 0;
backslash_mode:
if (code_len - bytes_read < 2)
goto need_more;
token_len = 2;
push_quoted(ctx, &code[1], 1);
} else if (*code == '\'') {
ctx->mode_stack->she_is_comment = 0;
sqoute_mode:
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1)
if (code[token_len] == '\'')
goto squote_end;
goto need_more;
squote_end:
token_len += 1;
push_quoted(ctx, &code[1], token_len - 2);
} else if (*code == '"') {
ctx->mode_stack->she_is_comment = 0;
dquote_mode:
token_len = 1;
push_mode(ctx, DQ_QUOTE_MODE);
push_enter(ctx, QUOTE_EXPRESSION);
} else if (*code == '`') {
ctx->mode_stack->she_is_comment = 0;
bquote_mode:
token_len = 1;
push_mode(ctx, BQ_QUOTE_MODE);
push_enter(ctx, BACKQUOTE_EXPRESSION);
} else if (*code == '$') {
ctx->mode_stack->she_is_comment = 0;
dollar_mode:
if (code_len - bytes_read < 2) {
if (ctx->end_of_file_reached) {
token_len = 1;
push_unquoted(ctx, code, 1);
} else {
goto need_more;
}
} else if (code[1] == '(') {
if (code_len - bytes_read < 3) {
goto need_more;
} else if (code[2] == '(') {
token_len = 3;
push_mode(ctx, RRB_QUOTE_MODE);
push_enter(ctx, ARITHMETIC_EXPRESSION);
} else {
token_len = 2;
push_mode(ctx, NORMAL_MODE);
push_enter(ctx, SUBSHELL_SUBSTITUTION);
}
} else if (code[1] == '[') {
token_len = 2;
push_mode(ctx, SB_QUOTE_MODE);
push_enter(ctx, ARITHMETIC_EXPRESSION);
} else if (code[1] == '{') {
token_len = 2;
push_mode(ctx, CB_QUOTE_MODE);
push_enter(ctx, VARIABLE_SUBSTITUTION);
} else if (code[1] == '\'') {
for (token_len = 2; token_len < code_len - bytes_read; token_len += 1) {
if (code[token_len] == '\\') {
if (token_len + 1 == code_len - bytes_read) {
token_len += 1;
} else {
goto need_more;
}
} else if (code[token_len] == '\'') {
goto dollar_squote_end;
}
}
dollar_squote_end:
token_len += 1;
push_escaped(ctx, &code[2], token_len - 3);
} else {
token_len = 1;
push_unquoted(ctx, code, 1);
}
} else {
ctx->mode_stack->she_is_comment = 0;
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1) {
if (isspace(code[token_len]) || IS_SYMBOL(code[token_len]) ||
code[token_len] == '\'' || code[token_len] == '"' ||
code[token_len] == '\\' || code[token_len] == '$' ||
code[token_len] == '`')
break;
}
push_unquoted(ctx, code, token_len);
}
break;
case COMMENT_MODE:
if (*code == '\n') {
token_len = 0; /* do not consume */
pop_mode(ctx);
} else {
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1)
if (code[token_len] == '\n')
break;
}
break;
case HERE_DOCUMENT_MODE:
/* TODO read until terminator, remove all <tab> (including on the
* line of the terminator) if <<- and then if terminator was
* unquoted, parse in " "-mode but accept " */
break;
case BQ_QUOTE_MODE:
if (*code == '\\') {
if (code_len - bytes_read < 2) {
goto need_more;
} else {
token_len = 2;
push_unquoted(ctx, code, 2);
}
} else if (*code == '`') {
token_len = 1;
pop_mode(ctx);
push_leave(ctx);
} else if (*code == '\n') {
token_len = 1;
ctx->tokeniser_line_number += 1;
push_unquoted(ctx, code, 1);
} else {
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1)
if (code[token_len] == '\n' || code[token_len] == '\\' || code[token_len] == '`')
break;
push_unquoted(ctx, code, token_len);
}
break;
case DQ_QUOTE_MODE:
if (*code == '"') {
token_len = 1;
pop_mode(ctx);
push_leave(ctx);
} else {
goto common_quote_mode;
}
break;
case RRB_QUOTE_MODE:
if (*code == ')') {
if (code_len - bytes_read < 2) {
goto need_more;
} else if (code[1] == ')') {
token_len = 2;
pop_mode(ctx);
push_leave(ctx);
} else {
goto common_quote_mode;
}
} else {
goto common_quote_mode;
}
break;
case RB_QUOTE_MODE:
if (*code == ')') {
token_len = 1;
pop_mode(ctx);
push_leave(ctx);
} else {
goto common_quote_mode;
}
break;
case SB_QUOTE_MODE:
if (*code == ']') {
token_len = 1;
pop_mode(ctx);
push_leave(ctx);
} else {
goto common_quote_mode;
}
break;
common_quote_mode:
if (*code == '(' && ctx->mode_stack->mode != DQ_QUOTE_MODE) {
if (code_len - bytes_read < 2) {
goto need_more;
} else if (code[1] == '(') {
token_len = 2;
push_mode(ctx, RRB_QUOTE_MODE);
push_enter(ctx, ARITHMETIC_EXPRESSION);
} else {
token_len = 1;
push_mode(ctx, RB_QUOTE_MODE);
push_enter(ctx, ARITHMETIC_EXPRESSION);
}
} else if (*code == '$') {
if (code_len - bytes_read < 2) {
if (ctx->end_of_file_reached) {
token_len = 1;
push_unquoted(ctx, code, 1);
} else {
goto need_more;
}
} else if (code[1] == '(') {
if (code_len - bytes_read < 3) {
goto need_more;
} else if (code[2] == '(') {
token_len = 3;
push_mode(ctx, RRB_QUOTE_MODE);
push_enter(ctx, ARITHMETIC_EXPRESSION);
} else {
token_len = 2;
push_mode(ctx, NORMAL_MODE);
push_enter(ctx, SUBSHELL_SUBSTITUTION);
}
} else if (code[1] == '[') {
token_len = 2;
push_mode(ctx, SB_QUOTE_MODE);
push_enter(ctx, ARITHMETIC_EXPRESSION);
} else if (code[1] == '{') {
token_len = 2;
push_mode(ctx, CB_QUOTE_MODE);
push_enter(ctx, VARIABLE_SUBSTITUTION);
} else {
token_len = 1;
push_unquoted(ctx, code, 1);
}
} else if (*code == '\\') {
if (code_len - bytes_read < 2) {
if (ctx->end_of_file_reached) {
token_len = 1;
push_unquoted(ctx, code, 1);
} else {
goto need_more;
}
} else if (code[1] == '$' || code[1] == '`' || code[1] == '"' || code[1] == '\\') {
token_len = 1;
push_quoted(ctx, &code[1], 1);
} else {
token_len = 1;
push_unquoted(ctx, code, 1);
}
} else if (*code == '`') {
goto bquote_mode;
} else if (*code == '\n') {
token_len = 1;
ctx->tokeniser_line_number += 1;
push_unquoted(ctx, code, 1);
} else {
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1) {
if (code[token_len] == '"' || code[token_len] == ')' ||
code[token_len] == ']' || code[token_len] == '(' ||
code[token_len] == '$' || code[token_len] == '\\' ||
code[token_len] == '`' || code[token_len] == '\n')
break;
}
push_unquoted(ctx, code, token_len);
}
break;
case CB_QUOTE_MODE:
if (*code == '}') {
token_len = 1;
pop_mode(ctx);
push_leave(ctx);
} else if (*code == '\\') {
goto backslash_mode;
} else if (*code == '\'') {
goto sqoute_mode;
} else if (*code == '"') {
goto dquote_mode;
} else if (*code == '`') {
goto bquote_mode;
} else if (*code == '$') {
goto dollar_mode;
} else if (*code == '\n') {
token_len = 1;
ctx->tokeniser_line_number += 1;
push_unquoted(ctx, code, 1);
} else {
for (token_len = 1; token_len < code_len - bytes_read; token_len += 1) {
if (code[token_len] == '}' || code[token_len] == '\\' ||
code[token_len] == '\'' || code[token_len] == '"' ||
code[token_len] == '`' || code[token_len] == '$' ||
code[token_len] == '\n')
break;
}
push_unquoted(ctx, code, token_len);
}
break;
default:
abort();
}
if (ctx->line_continuations) {
ctx->tokeniser_line_number += ctx->line_continuations;
ctx->line_continuations = 0;
}
}
if (bytes_read == code_len && ctx->end_of_file_reached)
push_end_of_file(ctx);
need_more:
return bytes_read;
#undef IS_SYMBOL
}
|
