mirror of https://github.com/jkjoy/sunpeiwen.git
919 lines
25 KiB
JavaScript
919 lines
25 KiB
JavaScript
let source, pos, end,
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openTokenDepth,
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lastTokenPos,
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openTokenPosStack,
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openClassPosStack,
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curDynamicImport,
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templateStackDepth,
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facade,
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lastSlashWasDivision,
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nextBraceIsClass,
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templateDepth,
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templateStack,
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imports,
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exports,
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name;
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function addImport (ss, s, e, d) {
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const impt = { ss, se: d === -2 ? e : d === -1 ? e + 1 : 0, s, e, d, a: -1, n: undefined };
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imports.push(impt);
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return impt;
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}
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function addExport (s, e, ls, le) {
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exports.push({
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s,
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e,
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ls,
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le,
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n: s[0] === '"' ? readString(s, '"') : s[0] === "'" ? readString(s, "'") : source.slice(s, e),
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ln: ls[0] === '"' ? readString(ls, '"') : ls[0] === "'" ? readString(ls, "'") : source.slice(ls, le)
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});
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}
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function readName (impt) {
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let { d, s } = impt;
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if (d !== -1)
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s++;
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impt.n = readString(s, source.charCodeAt(s - 1));
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}
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// Note: parsing is based on the _assumption_ that the source is already valid
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export function parse (_source, _name) {
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openTokenDepth = 0;
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curDynamicImport = null;
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templateDepth = -1;
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lastTokenPos = -1;
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lastSlashWasDivision = false;
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templateStack = Array(1024);
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templateStackDepth = 0;
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openTokenPosStack = Array(1024);
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openClassPosStack = Array(1024);
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nextBraceIsClass = false;
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facade = true;
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name = _name || '@';
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imports = [];
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exports = [];
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source = _source;
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pos = -1;
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end = source.length - 1;
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let ch = 0;
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// start with a pure "module-only" parser
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m: while (pos++ < end) {
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ch = source.charCodeAt(pos);
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if (ch === 32 || ch < 14 && ch > 8)
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continue;
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switch (ch) {
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case 101/*e*/:
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if (openTokenDepth === 0 && keywordStart(pos) && source.startsWith('xport', pos + 1)) {
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tryParseExportStatement();
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// export might have been a non-pure declaration
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if (!facade) {
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lastTokenPos = pos;
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break m;
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}
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}
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break;
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case 105/*i*/:
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if (keywordStart(pos) && source.startsWith('mport', pos + 1))
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tryParseImportStatement();
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break;
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case 59/*;*/:
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break;
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case 47/*/*/: {
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const next_ch = source.charCodeAt(pos + 1);
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if (next_ch === 47/*/*/) {
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lineComment();
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// dont update lastToken
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continue;
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}
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else if (next_ch === 42/***/) {
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blockComment(true);
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// dont update lastToken
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continue;
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}
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// fallthrough
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}
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default:
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// as soon as we hit a non-module token, we go to main parser
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facade = false;
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pos--;
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break m;
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}
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lastTokenPos = pos;
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}
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while (pos++ < end) {
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ch = source.charCodeAt(pos);
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if (ch === 32 || ch < 14 && ch > 8)
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continue;
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switch (ch) {
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case 101/*e*/:
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if (openTokenDepth === 0 && keywordStart(pos) && source.startsWith('xport', pos + 1))
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tryParseExportStatement();
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break;
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case 105/*i*/:
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if (keywordStart(pos) && source.startsWith('mport', pos + 1))
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tryParseImportStatement();
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break;
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case 99/*c*/:
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if (keywordStart(pos) && source.startsWith('lass', pos + 1) && isBrOrWs(source.charCodeAt(pos + 5)))
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nextBraceIsClass = true;
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break;
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case 40/*(*/:
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openTokenPosStack[openTokenDepth++] = lastTokenPos;
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break;
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case 41/*)*/:
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if (openTokenDepth === 0)
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syntaxError();
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openTokenDepth--;
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if (curDynamicImport && curDynamicImport.d === openTokenPosStack[openTokenDepth]) {
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if (curDynamicImport.e === 0)
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curDynamicImport.e = pos;
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curDynamicImport.se = pos;
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curDynamicImport = null;
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}
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break;
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case 123/*{*/:
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// dynamic import followed by { is not a dynamic import (so remove)
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// this is a sneaky way to get around { import () {} } v { import () }
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// block / object ambiguity without a parser (assuming source is valid)
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if (source.charCodeAt(lastTokenPos) === 41/*)*/ && imports.length && imports[imports.length - 1].e === lastTokenPos) {
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imports.pop();
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}
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openClassPosStack[openTokenDepth] = nextBraceIsClass;
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nextBraceIsClass = false;
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openTokenPosStack[openTokenDepth++] = lastTokenPos;
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break;
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case 125/*}*/:
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if (openTokenDepth === 0)
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syntaxError();
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if (openTokenDepth-- === templateDepth) {
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templateDepth = templateStack[--templateStackDepth];
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templateString();
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}
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else {
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if (templateDepth !== -1 && openTokenDepth < templateDepth)
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syntaxError();
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}
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break;
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case 39/*'*/:
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case 34/*"*/:
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stringLiteral(ch);
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break;
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case 47/*/*/: {
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const next_ch = source.charCodeAt(pos + 1);
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if (next_ch === 47/*/*/) {
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lineComment();
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// dont update lastToken
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continue;
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}
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else if (next_ch === 42/***/) {
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blockComment(true);
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// dont update lastToken
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continue;
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}
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else {
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// Division / regex ambiguity handling based on checking backtrack analysis of:
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// - what token came previously (lastToken)
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// - if a closing brace or paren, what token came before the corresponding
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// opening brace or paren (lastOpenTokenIndex)
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const lastToken = source.charCodeAt(lastTokenPos);
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if (isExpressionPunctuator(lastToken) &&
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!(lastToken === 46/*.*/ && (source.charCodeAt(lastTokenPos - 1) >= 48/*0*/ && source.charCodeAt(lastTokenPos - 1) <= 57/*9*/)) &&
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!(lastToken === 43/*+*/ && source.charCodeAt(lastTokenPos - 1) === 43/*+*/) && !(lastToken === 45/*-*/ && source.charCodeAt(lastTokenPos - 1) === 45/*-*/) ||
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lastToken === 41/*)*/ && isParenKeyword(openTokenPosStack[openTokenDepth]) ||
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lastToken === 125/*}*/ && (isExpressionTerminator(openTokenPosStack[openTokenDepth]) || openClassPosStack[openTokenDepth]) ||
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lastToken === 47/*/*/ && lastSlashWasDivision ||
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isExpressionKeyword(lastTokenPos) ||
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!lastToken) {
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regularExpression();
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lastSlashWasDivision = false;
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}
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else {
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lastSlashWasDivision = true;
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}
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}
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break;
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}
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case 96/*`*/:
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templateString();
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break;
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}
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lastTokenPos = pos;
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}
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if (templateDepth !== -1 || openTokenDepth)
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syntaxError();
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return [imports, exports, facade];
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}
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function tryParseImportStatement () {
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const startPos = pos;
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pos += 6;
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let ch = commentWhitespace(true);
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switch (ch) {
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// dynamic import
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case 40/*(*/:
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openTokenPosStack[openTokenDepth++] = startPos;
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if (source.charCodeAt(lastTokenPos) === 46/*.*/)
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return;
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// dynamic import indicated by positive d
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const impt = addImport(startPos, pos + 1, 0, startPos);
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curDynamicImport = impt;
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// try parse a string, to record a safe dynamic import string
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pos++;
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ch = commentWhitespace(true);
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if (ch === 39/*'*/ || ch === 34/*"*/) {
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stringLiteral(ch);
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}
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else {
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pos--;
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return;
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}
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pos++;
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ch = commentWhitespace(true);
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if (ch === 44/*,*/) {
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impt.e = pos;
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pos++;
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ch = commentWhitespace(true);
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impt.a = pos;
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readName(impt);
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pos--;
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}
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else if (ch === 41/*)*/) {
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openTokenDepth--;
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impt.e = pos;
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impt.se = pos;
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readName(impt);
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}
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else {
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pos--;
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}
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return;
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// import.meta
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case 46/*.*/:
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pos++;
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ch = commentWhitespace(true);
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// import.meta indicated by d === -2
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if (ch === 109/*m*/ && source.startsWith('eta', pos + 1) && source.charCodeAt(lastTokenPos) !== 46/*.*/)
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addImport(startPos, startPos, pos + 4, -2);
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return;
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default:
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// no space after "import" -> not an import keyword
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if (pos === startPos + 6)
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break;
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case 34/*"*/:
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case 39/*'*/:
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case 123/*{*/:
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case 42/***/:
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// import statement only permitted at base-level
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if (openTokenDepth !== 0) {
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pos--;
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return;
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}
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while (pos < end) {
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ch = source.charCodeAt(pos);
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if (ch === 39/*'*/ || ch === 34/*"*/) {
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readImportString(startPos, ch);
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return;
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}
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pos++;
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}
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syntaxError();
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}
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}
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function tryParseExportStatement () {
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const sStartPos = pos;
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const prevExport = exports.length;
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pos += 6;
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const curPos = pos;
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let ch = commentWhitespace(true);
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if (pos === curPos && !isPunctuator(ch))
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return;
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switch (ch) {
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// export default ...
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case 100/*d*/:
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addExport(pos, pos + 7, -1, -1);
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return;
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// export async? function*? name () {
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case 97/*a*/:
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pos += 5;
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commentWhitespace(true);
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// fallthrough
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case 102/*f*/:
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pos += 8;
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ch = commentWhitespace(true);
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if (ch === 42/***/) {
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pos++;
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ch = commentWhitespace(true);
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}
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const startPos = pos;
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ch = readToWsOrPunctuator(ch);
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addExport(startPos, pos, startPos, pos);
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pos--;
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return;
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// export class name ...
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case 99/*c*/:
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if (source.startsWith('lass', pos + 1) && isBrOrWsOrPunctuatorNotDot(source.charCodeAt(pos + 5))) {
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pos += 5;
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ch = commentWhitespace(true);
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const startPos = pos;
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ch = readToWsOrPunctuator(ch);
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addExport(startPos, pos, startPos, pos);
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pos--;
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return;
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}
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pos += 2;
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// fallthrough
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// export var/let/const name = ...(, name = ...)+
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case 118/*v*/:
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case 109/*l*/:
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// destructured initializations not currently supported (skipped for { or [)
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// also, lexing names after variable equals is skipped (export var p = function () { ... }, q = 5 skips "q")
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pos += 2;
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facade = false;
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do {
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pos++;
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ch = commentWhitespace(true);
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const startPos = pos;
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ch = readToWsOrPunctuator(ch);
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// dont yet handle [ { destructurings
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if (ch === 123/*{*/ || ch === 91/*[*/) {
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pos--;
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return;
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}
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if (pos === startPos)
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return;
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addExport(startPos, pos, startPos, pos);
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ch = commentWhitespace(true);
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if (ch === 61/*=*/) {
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pos--;
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return;
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}
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} while (ch === 44/*,*/);
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pos--;
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return;
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|
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// export {...}
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case 123/*{*/:
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pos++;
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ch = commentWhitespace(true);
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while (true) {
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const startPos = pos;
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readToWsOrPunctuator(ch);
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const endPos = pos;
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commentWhitespace(true);
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ch = readExportAs(startPos, endPos);
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// ,
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if (ch === 44/*,*/) {
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pos++;
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ch = commentWhitespace(true);
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}
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if (ch === 125/*}*/)
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break;
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if (pos === startPos)
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return syntaxError();
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if (pos > end)
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return syntaxError();
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}
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pos++;
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ch = commentWhitespace(true);
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break;
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// export *
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// export * as X
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case 42/***/:
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pos++;
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commentWhitespace(true);
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ch = readExportAs(pos, pos);
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ch = commentWhitespace(true);
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break;
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}
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|
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// from ...
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if (ch === 102/*f*/ && source.startsWith('rom', pos + 1)) {
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pos += 4;
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readImportString(sStartPos, commentWhitespace(true));
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// There were no local names.
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for (let i = prevExport; i < exports.length; ++i) {
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exports[i].ls = exports[i].le = -1;
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exports[i].ln = undefined;
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}
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}
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else {
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pos--;
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}
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}
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/*
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* Ported from Acorn
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*
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* MIT License
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* Copyright (C) 2012-2020 by various contributors (see AUTHORS)
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
|
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* furnished to do so, subject to the following conditions:
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|
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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|
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
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* THE SOFTWARE.
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*/
|
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let acornPos;
|
|
function readString (start, quote) {
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|
acornPos = start;
|
|
let out = '', chunkStart = acornPos;
|
|
for (;;) {
|
|
if (acornPos >= source.length) syntaxError();
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const ch = source.charCodeAt(acornPos);
|
|
if (ch === quote) break;
|
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if (ch === 92) { // '\'
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out += source.slice(chunkStart, acornPos);
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out += readEscapedChar();
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chunkStart = acornPos;
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|
}
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|
else if (ch === 0x2028 || ch === 0x2029) {
|
|
++acornPos;
|
|
}
|
|
else {
|
|
if (isBr(ch)) syntaxError();
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|
++acornPos;
|
|
}
|
|
}
|
|
out += source.slice(chunkStart, acornPos++);
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|
return out;
|
|
}
|
|
|
|
// Used to read escaped characters
|
|
|
|
function readEscapedChar () {
|
|
let ch = source.charCodeAt(++acornPos);
|
|
++acornPos;
|
|
switch (ch) {
|
|
case 110: return '\n'; // 'n' -> '\n'
|
|
case 114: return '\r'; // 'r' -> '\r'
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|
case 120: return String.fromCharCode(readHexChar(2)); // 'x'
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|
case 117: return readCodePointToString(); // 'u'
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|
case 116: return '\t'; // 't' -> '\t'
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|
case 98: return '\b'; // 'b' -> '\b'
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|
case 118: return '\u000b'; // 'v' -> '\u000b'
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|
case 102: return '\f'; // 'f' -> '\f'
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|
case 13: if (source.charCodeAt(acornPos) === 10) ++acornPos; // '\r\n'
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|
case 10: // ' \n'
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|
return '';
|
|
case 56:
|
|
case 57:
|
|
syntaxError();
|
|
default:
|
|
if (ch >= 48 && ch <= 55) {
|
|
let octalStr = source.substr(acornPos - 1, 3).match(/^[0-7]+/)[0];
|
|
let octal = parseInt(octalStr, 8);
|
|
if (octal > 255) {
|
|
octalStr = octalStr.slice(0, -1);
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|
octal = parseInt(octalStr, 8);
|
|
}
|
|
acornPos += octalStr.length - 1;
|
|
ch = source.charCodeAt(acornPos);
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|
if (octalStr !== '0' || ch === 56 || ch === 57)
|
|
syntaxError();
|
|
return String.fromCharCode(octal);
|
|
}
|
|
if (isBr(ch)) {
|
|
// Unicode new line characters after \ get removed from output in both
|
|
// template literals and strings
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|
return '';
|
|
}
|
|
return String.fromCharCode(ch);
|
|
}
|
|
}
|
|
|
|
// Used to read character escape sequences ('\x', '\u', '\U').
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|
|
|
function readHexChar (len) {
|
|
const start = acornPos;
|
|
let total = 0, lastCode = 0;
|
|
for (let i = 0; i < len; ++i, ++acornPos) {
|
|
let code = source.charCodeAt(acornPos), val;
|
|
|
|
if (code === 95) {
|
|
if (lastCode === 95 || i === 0) syntaxError();
|
|
lastCode = code;
|
|
continue;
|
|
}
|
|
|
|
if (code >= 97) val = code - 97 + 10; // a
|
|
else if (code >= 65) val = code - 65 + 10; // A
|
|
else if (code >= 48 && code <= 57) val = code - 48; // 0-9
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|
else break;
|
|
if (val >= 16) break;
|
|
lastCode = code;
|
|
total = total * 16 + val;
|
|
}
|
|
|
|
if (lastCode === 95 || acornPos - start !== len) syntaxError();
|
|
|
|
return total;
|
|
}
|
|
|
|
// Read a string value, interpreting backslash-escapes.
|
|
|
|
function readCodePointToString () {
|
|
const ch = source.charCodeAt(acornPos);
|
|
let code;
|
|
if (ch === 123) { // '{'
|
|
++acornPos;
|
|
code = readHexChar(source.indexOf('}', acornPos) - acornPos);
|
|
++acornPos;
|
|
if (code > 0x10FFFF) syntaxError();
|
|
} else {
|
|
code = readHexChar(4);
|
|
}
|
|
// UTF-16 Decoding
|
|
if (code <= 0xFFFF) return String.fromCharCode(code);
|
|
code -= 0x10000;
|
|
return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00);
|
|
}
|
|
|
|
/*
|
|
* </ Acorn Port>
|
|
*/
|
|
|
|
function readExportAs (startPos, endPos) {
|
|
let ch = source.charCodeAt(pos);
|
|
let ls = startPos, le = endPos;
|
|
if (ch === 97 /*a*/) {
|
|
pos += 2;
|
|
ch = commentWhitespace(true);
|
|
startPos = pos;
|
|
readToWsOrPunctuator(ch);
|
|
endPos = pos;
|
|
ch = commentWhitespace(true);
|
|
}
|
|
if (pos !== startPos)
|
|
addExport(startPos, endPos, ls, le);
|
|
return ch;
|
|
}
|
|
|
|
function readImportString (ss, ch) {
|
|
const startPos = pos + 1;
|
|
if (ch === 39/*'*/ || ch === 34/*"*/) {
|
|
stringLiteral(ch);
|
|
}
|
|
else {
|
|
syntaxError();
|
|
return;
|
|
}
|
|
const impt = addImport(ss, startPos, pos, -1);
|
|
readName(impt);
|
|
pos++;
|
|
ch = commentWhitespace(false);
|
|
if (ch !== 97/*a*/ || !source.startsWith('ssert', pos + 1)) {
|
|
pos--;
|
|
return;
|
|
}
|
|
const assertIndex = pos;
|
|
|
|
pos += 6;
|
|
ch = commentWhitespace(true);
|
|
if (ch !== 123/*{*/) {
|
|
pos = assertIndex;
|
|
return;
|
|
}
|
|
const assertStart = pos;
|
|
do {
|
|
pos++;
|
|
ch = commentWhitespace(true);
|
|
if (ch === 39/*'*/ || ch === 34/*"*/) {
|
|
stringLiteral(ch);
|
|
pos++;
|
|
ch = commentWhitespace(true);
|
|
}
|
|
else {
|
|
ch = readToWsOrPunctuator(ch);
|
|
}
|
|
if (ch !== 58/*:*/) {
|
|
pos = assertIndex;
|
|
return;
|
|
}
|
|
pos++;
|
|
ch = commentWhitespace(true);
|
|
if (ch === 39/*'*/ || ch === 34/*"*/) {
|
|
stringLiteral(ch);
|
|
}
|
|
else {
|
|
pos = assertIndex;
|
|
return;
|
|
}
|
|
pos++;
|
|
ch = commentWhitespace(true);
|
|
if (ch === 44/*,*/) {
|
|
pos++;
|
|
ch = commentWhitespace(true);
|
|
if (ch === 125/*}*/)
|
|
break;
|
|
continue;
|
|
}
|
|
if (ch === 125/*}*/)
|
|
break;
|
|
pos = assertIndex;
|
|
return;
|
|
} while (true);
|
|
impt.a = assertStart;
|
|
impt.se = pos + 1;
|
|
}
|
|
|
|
function commentWhitespace (br) {
|
|
let ch;
|
|
do {
|
|
ch = source.charCodeAt(pos);
|
|
if (ch === 47/*/*/) {
|
|
const next_ch = source.charCodeAt(pos + 1);
|
|
if (next_ch === 47/*/*/)
|
|
lineComment();
|
|
else if (next_ch === 42/***/)
|
|
blockComment(br);
|
|
else
|
|
return ch;
|
|
}
|
|
else if (br ? !isBrOrWs(ch): !isWsNotBr(ch)) {
|
|
return ch;
|
|
}
|
|
} while (pos++ < end);
|
|
return ch;
|
|
}
|
|
|
|
function templateString () {
|
|
while (pos++ < end) {
|
|
const ch = source.charCodeAt(pos);
|
|
if (ch === 36/*$*/ && source.charCodeAt(pos + 1) === 123/*{*/) {
|
|
pos++;
|
|
templateStack[templateStackDepth++] = templateDepth;
|
|
templateDepth = ++openTokenDepth;
|
|
return;
|
|
}
|
|
if (ch === 96/*`*/)
|
|
return;
|
|
if (ch === 92/*\*/)
|
|
pos++;
|
|
}
|
|
syntaxError();
|
|
}
|
|
|
|
function blockComment (br) {
|
|
pos++;
|
|
while (pos++ < end) {
|
|
const ch = source.charCodeAt(pos);
|
|
if (!br && isBr(ch))
|
|
return;
|
|
if (ch === 42/***/ && source.charCodeAt(pos + 1) === 47/*/*/) {
|
|
pos++;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
function lineComment () {
|
|
while (pos++ < end) {
|
|
const ch = source.charCodeAt(pos);
|
|
if (ch === 10/*\n*/ || ch === 13/*\r*/)
|
|
return;
|
|
}
|
|
}
|
|
|
|
function stringLiteral (quote) {
|
|
while (pos++ < end) {
|
|
let ch = source.charCodeAt(pos);
|
|
if (ch === quote)
|
|
return;
|
|
if (ch === 92/*\*/) {
|
|
ch = source.charCodeAt(++pos);
|
|
if (ch === 13/*\r*/ && source.charCodeAt(pos + 1) === 10/*\n*/)
|
|
pos++;
|
|
}
|
|
else if (isBr(ch))
|
|
break;
|
|
}
|
|
syntaxError();
|
|
}
|
|
|
|
function regexCharacterClass () {
|
|
while (pos++ < end) {
|
|
let ch = source.charCodeAt(pos);
|
|
if (ch === 93/*]*/)
|
|
return ch;
|
|
if (ch === 92/*\*/)
|
|
pos++;
|
|
else if (ch === 10/*\n*/ || ch === 13/*\r*/)
|
|
break;
|
|
}
|
|
syntaxError();
|
|
}
|
|
|
|
function regularExpression () {
|
|
while (pos++ < end) {
|
|
let ch = source.charCodeAt(pos);
|
|
if (ch === 47/*/*/)
|
|
return;
|
|
if (ch === 91/*[*/)
|
|
ch = regexCharacterClass();
|
|
else if (ch === 92/*\*/)
|
|
pos++;
|
|
else if (ch === 10/*\n*/ || ch === 13/*\r*/)
|
|
break;
|
|
}
|
|
syntaxError();
|
|
}
|
|
|
|
function readToWsOrPunctuator (ch) {
|
|
do {
|
|
if (isBrOrWs(ch) || isPunctuator(ch))
|
|
return ch;
|
|
} while (ch = source.charCodeAt(++pos));
|
|
return ch;
|
|
}
|
|
|
|
// Note: non-asii BR and whitespace checks omitted for perf / footprint
|
|
// if there is a significant user need this can be reconsidered
|
|
function isBr (c) {
|
|
return c === 13/*\r*/ || c === 10/*\n*/;
|
|
}
|
|
|
|
function isWsNotBr (c) {
|
|
return c === 9 || c === 11 || c === 12 || c === 32 || c === 160;
|
|
}
|
|
|
|
function isBrOrWs (c) {
|
|
return c > 8 && c < 14 || c === 32 || c === 160;
|
|
}
|
|
|
|
function isBrOrWsOrPunctuatorNotDot (c) {
|
|
return c > 8 && c < 14 || c === 32 || c === 160 || isPunctuator(c) && c !== 46/*.*/;
|
|
}
|
|
|
|
function keywordStart (pos) {
|
|
return pos === 0 || isBrOrWsOrPunctuatorNotDot(source.charCodeAt(pos - 1));
|
|
}
|
|
|
|
function readPrecedingKeyword (pos, match) {
|
|
if (pos < match.length - 1)
|
|
return false;
|
|
return source.startsWith(match, pos - match.length + 1) && (pos === 0 || isBrOrWsOrPunctuatorNotDot(source.charCodeAt(pos - match.length)));
|
|
}
|
|
|
|
function readPrecedingKeyword1 (pos, ch) {
|
|
return source.charCodeAt(pos) === ch && (pos === 0 || isBrOrWsOrPunctuatorNotDot(source.charCodeAt(pos - 1)));
|
|
}
|
|
|
|
// Detects one of case, debugger, delete, do, else, in, instanceof, new,
|
|
// return, throw, typeof, void, yield, await
|
|
function isExpressionKeyword (pos) {
|
|
switch (source.charCodeAt(pos)) {
|
|
case 100/*d*/:
|
|
switch (source.charCodeAt(pos - 1)) {
|
|
case 105/*i*/:
|
|
// void
|
|
return readPrecedingKeyword(pos - 2, 'vo');
|
|
case 108/*l*/:
|
|
// yield
|
|
return readPrecedingKeyword(pos - 2, 'yie');
|
|
default:
|
|
return false;
|
|
}
|
|
case 101/*e*/:
|
|
switch (source.charCodeAt(pos - 1)) {
|
|
case 115/*s*/:
|
|
switch (source.charCodeAt(pos - 2)) {
|
|
case 108/*l*/:
|
|
// else
|
|
return readPrecedingKeyword1(pos - 3, 101/*e*/);
|
|
case 97/*a*/:
|
|
// case
|
|
return readPrecedingKeyword1(pos - 3, 99/*c*/);
|
|
default:
|
|
return false;
|
|
}
|
|
case 116/*t*/:
|
|
// delete
|
|
return readPrecedingKeyword(pos - 2, 'dele');
|
|
default:
|
|
return false;
|
|
}
|
|
case 102/*f*/:
|
|
if (source.charCodeAt(pos - 1) !== 111/*o*/ || source.charCodeAt(pos - 2) !== 101/*e*/)
|
|
return false;
|
|
switch (source.charCodeAt(pos - 3)) {
|
|
case 99/*c*/:
|
|
// instanceof
|
|
return readPrecedingKeyword(pos - 4, 'instan');
|
|
case 112/*p*/:
|
|
// typeof
|
|
return readPrecedingKeyword(pos - 4, 'ty');
|
|
default:
|
|
return false;
|
|
}
|
|
case 110/*n*/:
|
|
// in, return
|
|
return readPrecedingKeyword1(pos - 1, 105/*i*/) || readPrecedingKeyword(pos - 1, 'retur');
|
|
case 111/*o*/:
|
|
// do
|
|
return readPrecedingKeyword1(pos - 1, 100/*d*/);
|
|
case 114/*r*/:
|
|
// debugger
|
|
return readPrecedingKeyword(pos - 1, 'debugge');
|
|
case 116/*t*/:
|
|
// await
|
|
return readPrecedingKeyword(pos - 1, 'awai');
|
|
case 119/*w*/:
|
|
switch (source.charCodeAt(pos - 1)) {
|
|
case 101/*e*/:
|
|
// new
|
|
return readPrecedingKeyword1(pos - 2, 110/*n*/);
|
|
case 111/*o*/:
|
|
// throw
|
|
return readPrecedingKeyword(pos - 2, 'thr');
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function isParenKeyword (curPos) {
|
|
return source.charCodeAt(curPos) === 101/*e*/ && source.startsWith('whil', curPos - 4) ||
|
|
source.charCodeAt(curPos) === 114/*r*/ && source.startsWith('fo', curPos - 2) ||
|
|
source.charCodeAt(curPos - 1) === 105/*i*/ && source.charCodeAt(curPos) === 102/*f*/;
|
|
}
|
|
|
|
function isPunctuator (ch) {
|
|
// 23 possible punctuator endings: !%&()*+,-./:;<=>?[]^{}|~
|
|
return ch === 33/*!*/ || ch === 37/*%*/ || ch === 38/*&*/ ||
|
|
ch > 39 && ch < 48 || ch > 57 && ch < 64 ||
|
|
ch === 91/*[*/ || ch === 93/*]*/ || ch === 94/*^*/ ||
|
|
ch > 122 && ch < 127;
|
|
}
|
|
|
|
function isExpressionPunctuator (ch) {
|
|
// 20 possible expression endings: !%&(*+,-.:;<=>?[^{|~
|
|
return ch === 33/*!*/ || ch === 37/*%*/ || ch === 38/*&*/ ||
|
|
ch > 39 && ch < 47 && ch !== 41 || ch > 57 && ch < 64 ||
|
|
ch === 91/*[*/ || ch === 94/*^*/ || ch > 122 && ch < 127 && ch !== 125/*}*/;
|
|
}
|
|
|
|
function isExpressionTerminator (curPos) {
|
|
// detects:
|
|
// => ; ) finally catch else
|
|
// as all of these followed by a { will indicate a statement brace
|
|
switch (source.charCodeAt(curPos)) {
|
|
case 62/*>*/:
|
|
return source.charCodeAt(curPos - 1) === 61/*=*/;
|
|
case 59/*;*/:
|
|
case 41/*)*/:
|
|
return true;
|
|
case 104/*h*/:
|
|
return source.startsWith('catc', curPos - 4);
|
|
case 121/*y*/:
|
|
return source.startsWith('finall', curPos - 6);
|
|
case 101/*e*/:
|
|
return source.startsWith('els', curPos - 3);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function syntaxError () {
|
|
throw Object.assign(new Error(`Parse error ${name}:${source.slice(0, pos).split('\n').length}:${pos - source.lastIndexOf('\n', pos - 1)}`), { idx: pos });
|
|
} |