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|
%option reentrant noyywrap nounput noinput nodefault
%{
#include <stdio.h>
#include <stdarg.h>
#include <posthaste/parser.h>
#include <posthaste/debug.h>
static void update_yylloc(struct parser *parser, YYLTYPE *lloc, const char *text)
{
(void)parser;
lloc->first_line = lloc->last_line;
lloc->first_column = lloc->last_column;
for (size_t i = 0; text[i] != 0; ++i) {
if (text[i] == '\n') {
lloc->last_line++;
/* flex uses 1 based indexing */
lloc->last_column = 1;
} else {
lloc->last_column++;
}
}
}
static void lex_fail(struct parser *p, struct src_loc loc, const char *msg, ...)
{
va_list args;
va_start(args, msg);
struct src_issue issue;
issue.loc = loc;
issue.fname = p->fname;
issue.buf = p->buf;
vsrc_issue(issue, msg, args);
va_end(args);
p->failed = true;
}
static ph_date_t lex_date(struct parser *p, struct src_loc loc, const char *date)
{
ph_date_t d = date_from_string(date);
if (!date_valid(d)) {
lex_fail(p, loc, "Not a valid date.");
return 0;
}
return d;
}
static int64_t lex_int(struct parser *p, struct src_loc loc, const char *num)
{
bool neg = num[0] == '-';
/* jump over minus sign */
if (neg)
num += 1;
int64_t sum = 0;
int64_t power = 1;
size_t n = strlen(num);
if (n > 18) {
lex_fail(p, loc, "Literal integer too large");
return 0;
}
for (size_t i = 0; i < n; ++i) {
/* jump over separators */
char c = num[n - i - 1];
if (c == '\'')
continue;
/* decimal value at i:th least significant place */
int64_t d = c - '0';
sum += d * power;
power *= 10;
}
if (sum > 1000000000000) {
lex_fail(p, loc, "Literal integer too large");
return 0;
}
if (neg)
sum = -sum;
return sum;
}
#define YY_USER_ACTION update_yylloc(parser, yylloc, yytext);
%}
IDENT [a-z][a-zA-Z0-9_]+
FUNC_IDENT [A-Z][a-z0-9_]+
PROC_IDENT [A-Z]{2}[A-Z0-9_]*
DATE_LITERAL [0-9]{4}-[0-9]{2}-[0-9]{2}
INT_LITERAL -?[0-9]+('[0-9][0-9][0-9]+)*
STRING \"(\\.|[^"\\])*\"
%x SC_COMMENT
%%
"(%" {BEGIN(SC_COMMENT);}
<SC_COMMENT>{
"(%" {parser->comment_nesting += 1;}
"%)" {
if (parser->comment_nesting)
parser->comment_nesting -= 1;
else
BEGIN(INITIAL);
}
/* magic to avoid lexer jamming on open braces */
"*"+ {}
[^(%\n]+ {}
[(] {}
\n {}
}
"(" {return LPAREN;}
")" {return RPAREN;}
"[" {return LSQUARE;}
"]" {return RSQUARE;}
"{" {return LCURLY;}
"}" {return RCURLY;}
"'" {return APOSTROPHE;}
"&" {return AMPERSAND;}
"," {return COMMA;}
"." {return DOT;}
"=" {return EQ;}
"<" {return LT;}
"+" {return PLUS;}
"-" {return MINUS;}
"*" {return MULT;}
"/" {return DIV;}
"var" {return VAR;}
"is" {return IS;}
"unless" {return UNLESS;}
"otherwise" {return OTHERWISE;}
"until" {return UNTIL;}
"do" {return DO;}
"done" {return DONE;}
"procedure" {return PROCEDURE;}
"function" {return FUNCTION;}
"return" {return RETURN;}
"print" {return PRINT;}
"end" {return END;}
{STRING} {
/* skip quotation marks */
yylval->str = strdup(yytext + 1);
yylval->str[strlen(yylval->str) - 1] = '\0';
return STRING;
}
{DATE_LITERAL} {
yylval->num = lex_date(parser, src_loc(*yylloc), yytext);
return DATE_LITERAL;
}
{INT_LITERAL} {
yylval->snum = lex_int(parser, src_loc(*yylloc), yytext);
return INT_LITERAL;
}
{IDENT} {
yylval->str = strdup(yytext);
return IDENT;
}
{FUNC_IDENT} {
yylval->str = strdup(yytext);
return FUNC_IDENT;
}
{PROC_IDENT} {
yylval->str = strdup(yytext);
return PROC_IDENT;
}
[[:space:]]+ {/* skip whitespace */}
. {
lex_fail(parser, src_loc(*yylloc), "Unexpected token: %s", yytext);
}
%%
|
