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tweak error messages a little

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Tangent Wantwight 2023-09-08 14:47:24 -04:00
parent d6eacc886b
commit 050c0568a8
2 changed files with 12 additions and 25 deletions
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13
src/parser.ts
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@ -10,9 +10,10 @@ const Comment = Regex(/#[^\n]*/y)
const PreWordWhitespace = Regex(/[^\S\n;]+/y).expects("whitespace");
const BackslashEscape = Regex(/\\(.)/y)
.expects("\\")
.map(([, char]) => ({ text: char }));
const BackslashEscape = Sequence(
Regex(/\\/y).expects("BACKSLASH"),
Regex(/./y).expects("CHAR")
).map(([, [char]]) => ({ text: char }));
const BARE_WORD_CHAR = /[^\s\\;\[]+/y;
const BARE_BRACKET_WORD_CHAR = /[^\s\\;\[\]]+/y;
@ -27,7 +28,7 @@ const Bracket: Pattern<ScriptPiece> = Sequence(
function bareWordTmpl(charRegex: RegExp) {
return Sequence(
Regex(/(?!["\{])/y),
Regex(/(?!["{])/y),
AtLeast(
1,
Choose<InterpolatedPiece>(
@ -65,10 +66,10 @@ const Brace: Pattern<string> = Sequence(
.expects("{")
.map((text) => `{${text}}`),
Regex(/\\./y)
.expects("\\")
.expects("BACKSLASH")
.map(([escape]) => escape),
Regex(/[^\\{}]+/y)
.expects("text")
.expects("CHAR")
.map(([text]) => text)
)
),

24
src/peg.ts
View file

@ -84,20 +84,14 @@ export function Choose<T>(...patterns: Pattern<T>[]): Pattern<T> {
.join(" | ");
return new Pattern(function (source, index) {
let furthestFound = index;
let furthestExpected = genericExpected;
let furthestExpected = this.expectLabel;
for (const pattern of patterns) {
const [value, furthest, expected] = pattern.match.call(
this,
source,
index
);
const [value, furthest, expected] = pattern.match(source, index);
if (value) {
return [value, furthest, expected];
} else if (furthest > furthestFound) {
furthestFound = furthest;
furthestExpected = expected;
} else if (furthest == furthestFound) {
furthestExpected = furthestExpected + " | " + expected;
}
}
return [null, furthestFound, furthestExpected];
@ -119,11 +113,7 @@ export function Sequence<T extends unknown[]>(
let furthestFound = index;
let furthestExpected = genericExpected;
for (const pattern of patterns) {
const [value, furthest, expected] = pattern.match.call(
this,
source,
index
);
const [value, furthest, expected] = pattern.match(source, index);
if (furthest > furthestFound) {
furthestFound = furthest;
furthestExpected = expected;
@ -157,11 +147,7 @@ export function AtLeast<T>(min: number, pattern: Pattern<T>): Pattern<T[]> {
let furthestFound = index;
let furthestExpected = this.expectLabel;
do {
const [value, furthest, expected] = pattern.match.call(
this as Pattern<T>,
source,
index
);
const [value, furthest, expected] = pattern.match(source, index);
if (furthest > furthestFound) {
furthestFound = furthest;
furthestExpected = expected;
@ -188,7 +174,7 @@ export function AtLeast<T>(min: number, pattern: Pattern<T>): Pattern<T[]> {
*/
export function Peek<T>(pattern: Pattern<T>): Pattern<T> {
return new Pattern(function (source, index) {
const [value, furthest, expected] = pattern.match.call(this, source, index);
const [value, furthest, expected] = pattern.match(source, index);
return [value ? [value[0], index] : null, furthest, expected];
}, pattern.expectLabel);
}