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pegjs/spec/compiler/passes/compute-var-names.spec.js

219 lines
6.8 KiB
JavaScript

describe("compiler pass |computeVarNames|", function() {
var pass = PEG.compiler.passes.computeVarNames;
var leafDetails = { resultVar: "result0" },
choiceDetails = {
resultVar: "result0",
alternatives: [
{ resultVar: "result0", posVar: "pos0" },
{ resultVar: "result0", posVar: "pos0" },
{ resultVar: "result0", posVar: "pos0" }
]
},
sequenceDetails = {
resultVar: "result0",
posVar: "pos0",
elements: [
{ resultVar: "result0", posVar: "pos1" },
{ resultVar: "result1", posVar: "pos1" },
{ resultVar: "result2", posVar: "pos1" }
]
};
function ruleDetails(details) { return { rules: [details] }; }
it("computes variable names for a choice", function() {
expect(pass).toChangeAST('start = &"a" / &"b" / &"c"', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0"],
expression: choiceDetails
}));
expect(pass).toChangeAST('start = &"a" / &"b"* / &"c"', ruleDetails({
resultVars: ["result0", "result1"],
posVars: ["pos0"],
expression: choiceDetails
}));
expect(pass).toChangeAST('start = &"a" / &(&"b") / &"c"', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0", "pos1"],
expression: choiceDetails
}));
});
it("computes variable names for a sequence", function() {
expect(pass).toChangeAST('start = ', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0"],
expression: { resultVar: "result0", posVar: "pos0" }
}));
expect(pass).toChangeAST('start = &"a" &"b" &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &"a" &"b" &"c"*', ruleDetails({
resultVars: ["result0", "result1", "result2", "result3"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &"a" &"b"* &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &"a" &("b"*)* &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2", "result3"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &"a"* &"b" &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &("a"*)* &"b" &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &(("a"*)*)* &"b" &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2", "result3"],
posVars: ["pos0", "pos1"],
expression: sequenceDetails
}));
expect(pass).toChangeAST('start = &"a" &(&"b") &"c"', ruleDetails({
resultVars: ["result0", "result1", "result2"],
posVars: ["pos0", "pos1", "pos2"],
expression: sequenceDetails
}));
});
it("computes variable names for a labeled", function() {
expect(pass).toChangeAST('start = label:&"a"', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0"],
expression: {
resultVar: "result0",
expression: { resultVar: "result0", posVar: "pos0" }
}
}));
});
it("computes variable names for a simple and", function() {
expect(pass).toChangeAST('start = &(&"a")', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0", "pos1"],
expression: {
resultVar: "result0",
posVar: "pos0",
expression: { resultVar: "result0", posVar: "pos1" }
}
}));
});
it("computes variable names for a simple not", function() {
expect(pass).toChangeAST('start = !(&"a")', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0", "pos1"],
expression: {
resultVar: "result0",
posVar: "pos0",
expression: { resultVar: "result0", posVar: "pos1" }
}
}));
});
it("computes variable names for a semantic and", function() {
expect(pass).toChangeAST('start = &{ code }', ruleDetails({
resultVars: ["result0"],
posVars: [],
expression: leafDetails
}));
});
it("computes variable names for a semantic not", function() {
expect(pass).toChangeAST('start = !{ code }', ruleDetails({
resultVars: ["result0"],
posVars: [],
expression: leafDetails
}));
});
it("computes variable names for an optional", function() {
expect(pass).toChangeAST('start = (&"a")?', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0"],
expression: {
resultVar: "result0",
expression: { resultVar: "result0", posVar: "pos0" }
}
}));
});
it("computes variable names for a zero or more", function() {
expect(pass).toChangeAST('start = (&"a")*', ruleDetails({
resultVars: ["result0", "result1"],
posVars: ["pos0"],
expression: {
resultVar: "result0",
expression: { resultVar: "result1", posVar: "pos0" }
}
}));
});
it("computes variable names for a one or more", function() {
expect(pass).toChangeAST('start = (&"a")+', ruleDetails({
resultVars: ["result0", "result1"],
posVars: ["pos0"],
expression: {
resultVar: "result0",
expression: { resultVar: "result1", posVar: "pos0" }
}
}));
});
it("computes variable names for an action", function() {
expect(pass).toChangeAST('start = &"a" { code }', ruleDetails({
resultVars: ["result0"],
posVars: ["pos0", "pos1"],
expression: {
resultVar: "result0",
posVar: "pos0",
expression: { resultVar: "result0", posVar: "pos1" }
}
}));
});
it("computes variable names for a rule reference", function() {
expect(pass).toChangeAST('start = a', ruleDetails({
resultVars: ["result0"],
posVars: [],
expression: leafDetails
}));
});
it("computes variable names for a literal", function() {
expect(pass).toChangeAST('start = "a"', ruleDetails({
resultVars: ["result0"],
posVars: [],
expression: leafDetails
}));
});
it("computes variable names for an any", function() {
expect(pass).toChangeAST('start = .', ruleDetails({
resultVars: ["result0"],
posVars: [],
expression: leafDetails
}));
});
it("computes variable names for a class", function() {
expect(pass).toChangeAST('start = [a-z]', ruleDetails({
resultVars: ["result0"],
posVars: [],
expression: leafDetails
}));
});
});