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Change name from binding to precedence, add readme info

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Krzosa Karol
2024-04-14 10:33:09 +02:00
parent 44eb8be1db
commit c99f669c0e
3 changed files with 107 additions and 71 deletions
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42
src/compiler/parse.c
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@@ -102,39 +102,35 @@ LC_FUNCTION LC_Token *LC_MatchKeyword(LC_Intern intern) {
// Pratt expression parser
// Based on this really good article: https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html
// clang-format off
LC_FUNCTION LC_BindingPower LC_MakeBP(int left, int right) {
LC_BindingPower result = {left, right};
return result;
}
LC_FUNCTION LC_BindingPower LC_GetBindingPower(LC_Binding binding, LC_TokenKind kind) {
if (binding == LC_Binding_Prefix) goto Prefix;
if (binding == LC_Binding_Infix) goto Infix;
if (binding == LC_Binding_Postfix) goto Postfix;
LC_FUNCTION LC_Precedence LC_MakePrecedence(int left, int right) { return {left, right}; }
LC_FUNCTION LC_Precedence LC_GetPrecedence(LC_PrecedenceKind p, LC_TokenKind kind) {
if (p == LC_PrecedenceKind_Prefix) goto Prefix;
if (p == LC_PrecedenceKind_Infix) goto Infix;
if (p == LC_PrecedenceKind_Postfix) goto Postfix;
LC_ASSERT(NULL, !"invalid codepath");
Prefix:
switch (kind) {
case LC_TokenKind_OpenBracket: return LC_MakeBP(-2, 22);
case LC_TokenKind_OpenBracket: return LC_MakePrecedence(-2, 22);
case LC_TokenKind_Mul: case LC_TokenKind_BitAnd: case LC_TokenKind_Keyword: case LC_TokenKind_OpenParen:
case LC_TokenKind_Sub: case LC_TokenKind_Add: case LC_TokenKind_Neg: case LC_TokenKind_Not: case LC_TokenKind_OpenBrace: return LC_MakeBP(-2, 20);
default: return LC_MakeBP(-1, -1);
case LC_TokenKind_Sub: case LC_TokenKind_Add: case LC_TokenKind_Neg: case LC_TokenKind_Not: case LC_TokenKind_OpenBrace: return LC_MakePrecedence(-2, 20);
default: return LC_MakePrecedence(-1, -1);
}
Infix:
switch (kind) {
case LC_TokenKind_Or: return LC_MakeBP(9, 10);
case LC_TokenKind_And: return LC_MakeBP(11, 12);
case LC_TokenKind_Or: return LC_MakePrecedence(9, 10);
case LC_TokenKind_And: return LC_MakePrecedence(11, 12);
case LC_TokenKind_Equals: case LC_TokenKind_NotEquals: case LC_TokenKind_GreaterThen:
case LC_TokenKind_GreaterThenEq: case LC_TokenKind_LesserThen: case LC_TokenKind_LesserThenEq: return LC_MakeBP(13, 14);
case LC_TokenKind_Sub: case LC_TokenKind_Add: case LC_TokenKind_BitOr: case LC_TokenKind_BitXor: return LC_MakeBP(15, 16);
case LC_TokenKind_GreaterThenEq: case LC_TokenKind_LesserThen: case LC_TokenKind_LesserThenEq: return LC_MakePrecedence(13, 14);
case LC_TokenKind_Sub: case LC_TokenKind_Add: case LC_TokenKind_BitOr: case LC_TokenKind_BitXor: return LC_MakePrecedence(15, 16);
case LC_TokenKind_RightShift: case LC_TokenKind_LeftShift: case LC_TokenKind_BitAnd:
case LC_TokenKind_Mul: case LC_TokenKind_Div: case LC_TokenKind_Mod: return LC_MakeBP(17, 18);
default: return LC_MakeBP(0, 0);
case LC_TokenKind_Mul: case LC_TokenKind_Div: case LC_TokenKind_Mod: return LC_MakePrecedence(17, 18);
default: return LC_MakePrecedence(0, 0);
}
Postfix:
switch (kind) {
case LC_TokenKind_Dot: case LC_TokenKind_OpenBracket: case LC_TokenKind_OpenParen: return LC_MakeBP(21, -2);
default: return LC_MakeBP(-1, -1);
case LC_TokenKind_Dot: case LC_TokenKind_OpenBracket: case LC_TokenKind_OpenParen: return LC_MakePrecedence(21, -2);
default: return LC_MakePrecedence(-1, -1);
}
}
@@ -142,7 +138,7 @@ LC_FUNCTION LC_AST *LC_ParseExprEx(int min_bp) {
LC_AST *left = NULL;
LC_Token *prev = LC_GetI(-1);
LC_Token *t = LC_Next();
LC_BindingPower prefixbp = LC_GetBindingPower(LC_Binding_Prefix, t->kind);
LC_Precedence prefixbp = LC_GetPrecedence(LC_PrecedenceKind_Prefix, t->kind);
// parse prefix expression
switch (t->kind) {
@@ -240,8 +236,8 @@ LC_FUNCTION LC_AST *LC_ParseExprEx(int min_bp) {
// it's not so we don't recurse - we break
// We do the for loop instead
LC_BindingPower postfix_bp = LC_GetBindingPower(LC_Binding_Postfix, t->kind);
LC_BindingPower infix_bp = LC_GetBindingPower(LC_Binding_Infix, t->kind);
LC_Precedence postfix_bp = LC_GetPrecedence(LC_PrecedenceKind_Postfix, t->kind);
LC_Precedence infix_bp = LC_GetPrecedence(LC_PrecedenceKind_Infix, t->kind);
// parse postfix expression
if (postfix_bp.left > min_bp) {