You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
12 years ago
|
/* Checks that all referenced rules exist. */
|
||
|
PEG.compiler.passes.reportMissingRules = function(ast) {
|
||
|
function nop() {}
|
||
|
|
||
|
function checkExpression(node) { check(node.expression); }
|
||
|
|
||
|
function checkSubnodes(propertyName) {
|
||
|
return function(node) { each(node[propertyName], check); };
|
||
|
}
|
||
|
|
||
|
var check = buildNodeVisitor({
|
||
|
grammar: checkSubnodes("rules"),
|
||
|
rule: checkExpression,
|
||
|
choice: checkSubnodes("alternatives"),
|
||
|
sequence: checkSubnodes("elements"),
|
||
|
labeled: checkExpression,
|
||
|
simple_and: checkExpression,
|
||
|
simple_not: checkExpression,
|
||
|
semantic_and: nop,
|
||
|
semantic_not: nop,
|
||
|
optional: checkExpression,
|
||
|
zero_or_more: checkExpression,
|
||
|
one_or_more: checkExpression,
|
||
|
action: checkExpression,
|
||
|
|
||
|
rule_ref:
|
||
|
function(node) {
|
||
|
if (!findRuleByName(ast, node.name)) {
|
||
|
throw new PEG.GrammarError(
|
||
|
"Referenced rule \"" + node.name + "\" does not exist."
|
||
|
);
|
||
|
}
|
||
|
},
|
||
|
|
||
|
literal: nop,
|
||
|
any: nop,
|
||
|
"class": nop
|
||
|
});
|
||
|
|
||
|
check(ast);
|
||
|
};
|