Raphael CoefficandPeter Feerick
66932626d5
and added some support for reading such escaped characters.
317 lines
8.7 KiB
C++
317 lines
8.7 KiB
C++
/*
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* Copyright (C) EdgeTX
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*
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* Based on code named
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* opentx - https://github.com/opentx/opentx
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* th9x - http://code.google.com/p/th9x
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* er9x - http://code.google.com/p/er9x
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* gruvin9x - http://code.google.com/p/gruvin9x
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*
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* License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include "yaml_parser.h"
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#include "debug.h"
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YamlParser::YamlParser()
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{
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}
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void YamlParser::init(const YamlParserCalls* parser_calls, void* parser_ctx)
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{
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indent = 0;
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level = 0;
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memset(indents, 0, sizeof(indents));
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saved_state = 0;
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calls = parser_calls;
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ctx = parser_ctx;
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reset();
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}
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void YamlParser::reset()
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{
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state = saved_state;
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if (state != ps_Dash) {
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indents[level] = indent;
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state = saved_state = ps_Indent;
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}
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indent = scratch_len = 0;
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node_found = false;
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}
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bool YamlParser::toChild()
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{
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bool ret = calls->to_child(ctx);
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if (ret) level++;
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return ret;
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}
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bool YamlParser::toParent()
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{
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if (!level)
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return false;
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bool ret = calls->to_parent(ctx);
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if (ret) level--;
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return ret;
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}
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uint8_t YamlParser::getLastIndent()
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{
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return indents[level];
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}
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YamlParser::YamlResult
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YamlParser::parse(const char* buffer, unsigned int size)
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{
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#define CONCAT_STR(s,s_len,c) \
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{ \
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if(s_len < MAX_STR) \
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s[s_len++] = c; \
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else { \
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TRACE_YAML("STRING_OVERFLOW"); \
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return STRING_OVERFLOW; \
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} \
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}
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const char* c = buffer;
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const char* end = c + size;
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while(c < end) {
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switch(state) {
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case ps_Indent:
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if (*c == '-') {
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state = ps_Dash;
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++indent;
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break;
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}
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// trap
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case ps_Dash:
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if (*c == ' ') { // skip space(s), should be only one??
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++indent;
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break;
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}
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if (*c == '\r' || *c == '\n') {
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saved_state = state;
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state = ps_CRLF;
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continue;
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}
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if (indent < getLastIndent()) {
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// go up as many levels as necessary
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do {
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if (!toParent()) {
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TRACE_YAML("STOP (no parent)!\n");
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return DONE_PARSING;
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}
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} while (indent < getLastIndent());
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// attribute on same line as dash
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if (state == ps_Dash) {
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if (!calls->to_next_elmt(ctx)) {
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return DONE_PARSING;
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}
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}
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}
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// go down one level
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else if (indent > getLastIndent()) {
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// TODO: check dash?
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if (!toChild()) {
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TRACE_YAML("STOP (stack full)!\n");
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return DONE_PARSING; // ERROR
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}
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}
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// same level, next element
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else if (state == ps_Dash || saved_state == ps_Dash) {
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// attribute on same line or next line as dash
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if (!calls->to_next_elmt(ctx)) {
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return DONE_PARSING;
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}
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}
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state = ps_Attr;
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if (*c == '\"') {
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state = ps_AttrQuo;
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break;
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}
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CONCAT_STR(scratch_buf, scratch_len, *c);
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break;
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case ps_AttrQuo:
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if (*c == '\"') {
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state = ps_Attr;
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break;
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}
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CONCAT_STR(scratch_buf, scratch_len, *c);
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break;
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case ps_Attr:
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if (*c == '\"') {
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state = ps_AttrQuo;
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break;
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}
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if ((*c != ':') && (*c != '\r') && (*c != '\n'))
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CONCAT_STR(scratch_buf, scratch_len, *c);
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// trap
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case ps_AttrSP:
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if (*c == '\r' || *c == '\n') {
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if (state == ps_Attr) {
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// TODO: trim spaces at the end?
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node_found = calls->find_node(ctx, scratch_buf, scratch_len);
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if (!node_found) {
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TRACE_YAML("YAML_PARSER: Could not find node '%.*s' (2)\n",
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scratch_len, scratch_buf);
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}
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}
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saved_state = state;
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state = ps_CRLF;
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continue;
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}
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if (*c == ':') {
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if (state == ps_Attr) {
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// TODO: trim spaces at the end?
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node_found = calls->find_node(ctx, scratch_buf, scratch_len);
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if (!node_found) {
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TRACE_YAML("YAML_PARSER: Could not find node '%.*s' (3)\n",
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scratch_len, scratch_buf);
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}
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}
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state = ps_Sep;
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break;
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}
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break;
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case ps_Sep:
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if (*c == ' ')
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break;
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if (*c == '\r' || *c == '\n'){
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saved_state = state;
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state = ps_CRLF;
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continue;
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}
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state = ps_Val;
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scratch_len = 0;
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if (*c == '\"') {
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state = ps_ValQuo;
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break;
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}
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if (*c == '\\') {
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state = ps_ValEsc;
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break;
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}
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CONCAT_STR(scratch_buf, scratch_len, *c);
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break;
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case ps_ValQuo:
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if (*c == '\"') {
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state = ps_Val;
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break;
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}
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if (*c == '\\') {
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state = ps_ValEsc1;
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break;
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}
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CONCAT_STR(scratch_buf, scratch_len, *c);
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break;
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case ps_ValEsc1:
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if (*c == 'x') {
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state = ps_ValEsc2;
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break;
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}
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//TODO: more escapes needed???
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TRACE_YAML("unknown escape char '%c'",*c);
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return DONE_PARSING;
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case ps_ValEsc2:
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if(scratch_len >= MAX_STR) {
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TRACE_YAML("STRING_OVERFLOW");
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return STRING_OVERFLOW;
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}
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else if (*c >= '0' && *c <= '9') {
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scratch_buf[scratch_len] = (*c - '0') << 4;
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state = ps_ValEsc3;
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break;
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}
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else if (*c >= 'A' && *c <= 'F') {
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scratch_buf[scratch_len] = (*c - 'A' + 10) << 4;
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state = ps_ValEsc3;
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break;
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}
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TRACE_YAML("wrong hex digit '%c'",*c);
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return DONE_PARSING;
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case ps_ValEsc3:
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if (*c >= '0' && *c <= '9') {
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scratch_buf[scratch_len++] |= (*c - '0');
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state = ps_ValQuo;
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break;
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}
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else if (*c >= 'A' && *c <= 'F') {
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scratch_buf[scratch_len++] |= (*c - 'A' + 10);
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state = ps_ValQuo;
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break;
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}
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TRACE_YAML("wrong hex digit '%c'",*c);
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return DONE_PARSING;
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case ps_Val:
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if (*c == '\r' || *c == '\n') {
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// set attribute
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if (node_found) {
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// TODO: trim spaces at the end?
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calls->set_attr(ctx, scratch_buf, scratch_len);
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}
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saved_state = state;
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state = ps_CRLF;
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continue;
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}
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if (*c == '\"') {
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state = ps_ValQuo;
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break;
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}
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if (*c == '\\') {
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state = ps_ValEsc;
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break;
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}
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CONCAT_STR(scratch_buf, scratch_len, *c);
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break;
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case ps_ValEsc:
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state = ps_Val;
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CONCAT_STR(scratch_buf, scratch_len, *c);
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break;
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case ps_CRLF:
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if (*c == '\n') {
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// reset state at EOL
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reset();
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}
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break;
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}
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c++;
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} // for each char
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return CONTINUE_PARSING;
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}
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