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better css lexer

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This commit is contained in:
Alessandro Mauri 2025-07-13 21:43:57 +02:00
parent dd073385c8
commit 8367f6b617
1 changed files with 17 additions and 19 deletions
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36
lib/ugui.c3l/src/ugui_style.c3
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@ -115,7 +115,10 @@ import std::io;
enum TokenType {
INVALID,
IDENTIFIER,
PUNCT,
RCURLY,
LCURLY,
SEMICOLON,
COLON,
NUMBER,
COLOR,
EOF,
@ -191,10 +194,16 @@ fn Token Lexer.next_token(&lex)
switch (true) {
case ascii::is_punct_m(lex.peep()) && lex.peep() != '#': // punctuation
t.type = PUNCT;
t.text = lex.text[lex.off:1];
if (lex.advance() == 0) { t.type = INVALID; break; }
switch (t.text[0]) {
case ':': t.type = COLON;
case ';': t.type = SEMICOLON;
case '{': t.type = LCURLY;
case '}': t.type = RCURLY;
default: t.type = INVALID;
}
case lex.peep() == '#': // color
t.type = COLOR;
if (lex.advance() == 0) { t.type = INVALID; break; }
@ -276,17 +285,6 @@ struct Parser {
float mm_to_px;
}
macro bool Parser.expect_text(&p, Token* t, TokenType type, String text)
{
*t = p.lex.next_token();
if (t.type == type && t.text == text) {
return true;
}
io::eprintfn("CSS parsing error at %d:%d: expected type:%s text:'%s' but got type:%s text:'%s'",
t.line, t.col, type, text, t.type, t.text);
return false;
}
macro bool Parser.expect(&p, Token* t, TokenType type)
{
*t = p.lex.next_token();
@ -306,7 +304,7 @@ fn bool Parser.parse_style(&p)
p.style_id = t.text.hash();
// style body
if (p.expect_text(&t, PUNCT, "{") == false) return false;
if (p.expect(&t, LCURLY) == false) return false;
while (true) {
if (p.parse_property() == false) return false;
@ -314,7 +312,7 @@ fn bool Parser.parse_style(&p)
if (t.type != IDENTIFIER) break;
}
if (p.expect_text(&t, PUNCT, "}") == false) return false;
if (p.expect(&t, RCURLY) == false) return false;
return true;
}
@ -323,7 +321,7 @@ fn bool Parser.parse_property(&p)
{
Token t, prop;
if (p.expect(&prop, IDENTIFIER) == false) return false;
if (p.expect_text(&t, PUNCT, ":") == false) return false;
if (p.expect(&t, COLON) == false) return false;
switch (prop.text) {
case "padding":
@ -389,7 +387,7 @@ fn bool Parser.parse_property(&p)
io::eprintfn("CSS parsing error at %d:%d: '%s' is not a valid property", prop.line, prop.col, prop.text);
return false;
}
if (p.expect_text(&t, PUNCT, ";") == false) return false;
if (p.expect(&t, SEMICOLON) == false) return false;
return true;
}
@ -428,7 +426,7 @@ fn bool Parser.parse_size(&p, Rect* r)
if (p.parse_number(&x) == false) return false;
r.h = x;
return true;
} else if (t.type == PUNCT && t.text == ";") {
} else if (t.type == SEMICOLON) {
// just one number, all dimensions are the same
r.x = r.y = r.w = r.h = x;
return true;