141 lines
3.6 KiB
C++
141 lines
3.6 KiB
C++
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#include <iostream>
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#include <string>
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#include <stdio.h>
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#include <ctype.h> /* isspace() */
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#include "parse-input.h"
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using namespace std;
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#define SET_ERROR(err, args...) \
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do { \
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error = true; \
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sprintf(errstr, err " at line %d, column %d", ##args, lineno, colno); \
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} while(0)
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void parse_input(refptr< vector<unichar_t> > ucs)
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{
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enum State { INITIAL, SECTION_NAME, RULES, RULE_NAME, RULE_COLON,
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RULE_EQUALS, RULE_RHS };
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State state = INITIAL;
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int lineno = 1;
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int colno = 1;
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bool error = false;
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char errstr[200];
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unistring build_str;
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for (int i = 0, sz = ucs->size(); i < sz; i++)
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{
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unichar_t c = (*ucs)[i];
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if (c == '\n')
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{
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lineno++;
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colno = 1;
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}
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else
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{
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colno++;
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}
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switch (state)
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{
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case INITIAL:
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if (c == '[')
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{
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state = SECTION_NAME;
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build_str = "";
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}
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else if (isspace(c))
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{
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}
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else
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{
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SET_ERROR("Unexpected character 0x%x (%c) in input file",
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c, c);
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}
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break;
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case SECTION_NAME:
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switch (c)
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{
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case ']':
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if (build_str == "rules")
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{
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state = RULES;
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}
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else
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{
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SET_ERROR("Unknown section name");
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}
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break;
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case '\n':
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SET_ERROR("Unterminated section header");
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break;
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}
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break;
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case RULES:
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if (isspace(c))
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{
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}
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else if ( ('a' <= c && c <= 'z')
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|| ('A' <= c && c <= 'Z')
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|| (c == '_') )
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{
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build_str = "";
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build_str += c;
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state = RULE_NAME;
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}
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else
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{
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SET_ERROR("Unexpected character");
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}
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break;
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case RULE_NAME:
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if ( ('a' <= c && c <= 'z')
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|| ('A' <= c && c <= 'Z')
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|| ('0' <= c && c <= '9')
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|| (c == '_') )
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{
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build_str += c;
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}
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else if (isspace(c))
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{
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state = RULE_COLON;
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}
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else
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{
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SET_ERROR("Expected ':='");
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}
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break;
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case RULE_COLON:
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if (isspace(c))
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{
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}
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else if (c == ':')
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{
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state = RULE_EQUALS;
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}
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else
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{
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SET_ERROR("Expected ':='");
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}
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break;
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case RULE_EQUALS:
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if (c == '=')
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{
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state = RULE_RHS;
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}
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else
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{
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SET_ERROR("Expected '='");
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}
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break;
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case RULE_RHS:
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break;
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}
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if (error)
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{
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cerr << errstr << endl;
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break;
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}
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}
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}
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