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1588 lines
53 KiB
JavaScript
1588 lines
53 KiB
JavaScript
/* eslint no-mixed-operators: 0, prefer-const: 0 */
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"use strict";
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const asts = require( "../asts" );
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const js = require( "../js" );
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const op = require( "../opcodes" );
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// Generates parser JavaScript code.
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function generateJS( ast, options ) {
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/* These only indent non-empty lines to avoid trailing whitespace. */
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const lineMatchRE = /^([^`\r\n]+?(?:`[^`]*?`[^\r\n]*?)?)$/gm;
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function indent2( code ) {
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return code.replace( lineMatchRE, " $1" );
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}
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function indent10( code ) {
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return code.replace( lineMatchRE, " $1" );
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}
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function generateTables() {
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if ( options.optimize === "size" ) {
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return [
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"var peg$consts = [",
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indent2( ast.consts.join( ",\n" ) ),
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"];",
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"",
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"var peg$bytecode = [",
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indent2( ast.rules
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.map( rule =>
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`peg$decode("${
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js.stringEscape( rule.bytecode
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.map( b => String.fromCharCode( b + 32 ) )
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.join( "" )
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)
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}")`
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)
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.join( ",\n" )
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),
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"];"
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].join( "\n" );
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}
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return ast.consts.map( ( c, i ) => "var peg$c" + i + " = " + c + ";" ).join( "\n" );
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}
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function generateRuleHeader( ruleNameCode, ruleIndexCode ) {
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const parts = [];
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parts.push( "" );
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if ( options.trace ) {
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parts.push( [
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"peg$tracer.trace({",
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" type: \"rule.enter\",",
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" rule: " + ruleNameCode + ",",
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" location: peg$computeLocation(startPos, startPos)",
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"});",
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""
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].join( "\n" ) );
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}
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if ( options.cache ) {
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parts.push( [
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"var key = peg$currPos * " + ast.rules.length + " + " + ruleIndexCode + ";",
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"var cached = peg$resultsCache[key];",
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"",
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"if (cached) {",
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" peg$currPos = cached.nextPos;",
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""
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].join( "\n" ) );
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if ( options.trace ) {
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parts.push( [
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"if (cached.result !== peg$FAILED) {",
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" peg$tracer.trace({",
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" type: \"rule.match\",",
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" rule: " + ruleNameCode + ",",
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" result: cached.result,",
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" location: peg$computeLocation(startPos, peg$currPos)",
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" });",
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"} else {",
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" peg$tracer.trace({",
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" type: \"rule.fail\",",
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" rule: " + ruleNameCode + ",",
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" location: peg$computeLocation(startPos, startPos)",
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" });",
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"}",
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""
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].join( "\n" ) );
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}
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parts.push( [
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" return cached.result;",
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"}",
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""
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].join( "\n" ) );
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}
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return parts.join( "\n" );
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}
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function generateRuleFooter( ruleNameCode, resultCode ) {
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const parts = [];
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if ( options.cache ) {
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parts.push( [
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"",
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"peg$resultsCache[key] = { nextPos: peg$currPos, result: " + resultCode + " };"
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].join( "\n" ) );
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}
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if ( options.trace ) {
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parts.push( [
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"",
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"if (" + resultCode + " !== peg$FAILED) {",
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" peg$tracer.trace({",
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" type: \"rule.match\",",
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" rule: " + ruleNameCode + ",",
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" result: " + resultCode + ",",
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" location: peg$computeLocation(startPos, peg$currPos)",
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" });",
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"} else {",
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" peg$tracer.trace({",
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" type: \"rule.fail\",",
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" rule: " + ruleNameCode + ",",
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" location: peg$computeLocation(startPos, startPos)",
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" });",
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"}"
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].join( "\n" ) );
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}
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parts.push( [
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"",
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"return " + resultCode + ";"
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].join( "\n" ) );
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return parts.join( "\n" );
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}
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function generateInterpreter() {
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const parts = [];
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function generateCondition( cond, argsLength ) {
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const baseLength = argsLength + 3;
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const thenLengthCode = "bc[ip + " + ( baseLength - 2 ) + "]";
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const elseLengthCode = "bc[ip + " + ( baseLength - 1 ) + "]";
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return [
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"ends.push(end);",
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"ips.push(ip + " + baseLength + " + " + thenLengthCode + " + " + elseLengthCode + ");",
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"",
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"if (" + cond + ") {",
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" end = ip + " + baseLength + " + " + thenLengthCode + ";",
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" ip += " + baseLength + ";",
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"} else {",
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" end = ip + " + baseLength + " + " + thenLengthCode + " + " + elseLengthCode + ";",
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" ip += " + baseLength + " + " + thenLengthCode + ";",
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"}",
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"",
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"break;"
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].join( "\n" );
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}
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function generateLoop( cond ) {
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const baseLength = 2;
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const bodyLengthCode = "bc[ip + " + ( baseLength - 1 ) + "]";
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return [
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"if (" + cond + ") {",
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" ends.push(end);",
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" ips.push(ip);",
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"",
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" end = ip + " + baseLength + " + " + bodyLengthCode + ";",
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" ip += " + baseLength + ";",
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"} else {",
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" ip += " + baseLength + " + " + bodyLengthCode + ";",
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"}",
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"",
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"break;"
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].join( "\n" );
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}
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function generateCall() {
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const baseLength = 4;
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const paramsLengthCode = "bc[ip + " + ( baseLength - 1 ) + "]";
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return [
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"params = bc.slice(ip + " + baseLength + ", ip + " + baseLength + " + " + paramsLengthCode + ")",
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" .map(function(p) { return stack[stack.length - 1 - p]; });",
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"",
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"stack.splice(",
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" stack.length - bc[ip + 2],",
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" bc[ip + 2],",
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" peg$consts[bc[ip + 1]].apply(null, params)",
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");",
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"",
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"ip += " + baseLength + " + " + paramsLengthCode + ";",
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"break;"
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].join( "\n" );
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}
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parts.push( [
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"function peg$decode(s) {",
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" return s.split(\"\").map(function(ch) { return ch.charCodeAt(0) - 32; });",
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"}",
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"",
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"function peg$parseRule(index) {"
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].join( "\n" ) );
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if ( options.trace ) {
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parts.push( [
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" var bc = peg$bytecode[index];",
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" var ip = 0;",
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" var ips = [];",
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" var end = bc.length;",
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" var ends = [];",
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" var stack = [];",
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" var startPos = peg$currPos;",
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" var params;"
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].join( "\n" ) );
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} else {
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parts.push( [
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" var bc = peg$bytecode[index];",
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" var ip = 0;",
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" var ips = [];",
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" var end = bc.length;",
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" var ends = [];",
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" var stack = [];",
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" var params;"
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].join( "\n" ) );
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}
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parts.push( indent2( generateRuleHeader( "peg$ruleNames[index]", "index" ) ) );
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parts.push( [
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// The point of the outer loop and the |ips| & |ends| stacks is to avoid
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// recursive calls for interpreting parts of bytecode. In other words, we
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// implement the |interpret| operation of the abstract machine without
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// function calls. Such calls would likely slow the parser down and more
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// importantly cause stack overflows for complex grammars.
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" while (true) {",
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" while (ip < end) {",
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" switch (bc[ip]) {",
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" case " + op.PUSH + ":", // PUSH c
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" stack.push(peg$consts[bc[ip + 1]]);",
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" ip += 2;",
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" break;",
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"",
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" case " + op.PUSH_UNDEFINED + ":", // PUSH_UNDEFINED
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" stack.push(undefined);",
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" ip++;",
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" break;",
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"",
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" case " + op.PUSH_NULL + ":", // PUSH_NULL
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" stack.push(null);",
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" ip++;",
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" break;",
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"",
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" case " + op.PUSH_FAILED + ":", // PUSH_FAILED
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" stack.push(peg$FAILED);",
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" ip++;",
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" break;",
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"",
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" case " + op.PUSH_EMPTY_ARRAY + ":", // PUSH_EMPTY_ARRAY
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" stack.push([]);",
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" ip++;",
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" break;",
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"",
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" case " + op.PUSH_CURR_POS + ":", // PUSH_CURR_POS
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" stack.push(peg$currPos);",
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" ip++;",
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" break;",
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"",
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" case " + op.POP + ":", // POP
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" stack.pop();",
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" ip++;",
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" break;",
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"",
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" case " + op.POP_CURR_POS + ":", // POP_CURR_POS
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" peg$currPos = stack.pop();",
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" ip++;",
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" break;",
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"",
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" case " + op.POP_N + ":", // POP_N n
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" stack.length -= bc[ip + 1];",
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" ip += 2;",
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" break;",
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"",
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" case " + op.NIP + ":", // NIP
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" stack.splice(-2, 1);",
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" ip++;",
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" break;",
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"",
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" case " + op.APPEND + ":", // APPEND
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" stack[stack.length - 2].push(stack.pop());",
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" ip++;",
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" break;",
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"",
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" case " + op.WRAP + ":", // WRAP n
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" stack.push(stack.splice(stack.length - bc[ip + 1], bc[ip + 1]));",
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" ip += 2;",
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" break;",
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"",
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" case " + op.TEXT + ":", // TEXT
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" stack.push(input.substring(stack.pop(), peg$currPos));",
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" ip++;",
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" break;",
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"",
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" case " + op.IF + ":", // IF t, f
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indent10( generateCondition( "stack[stack.length - 1]", 0 ) ),
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"",
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" case " + op.IF_ERROR + ":", // IF_ERROR t, f
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indent10( generateCondition(
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"stack[stack.length - 1] === peg$FAILED",
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0
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) ),
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"",
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" case " + op.IF_NOT_ERROR + ":", // IF_NOT_ERROR t, f
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indent10(
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generateCondition( "stack[stack.length - 1] !== peg$FAILED",
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0
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) ),
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"",
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" case " + op.WHILE_NOT_ERROR + ":", // WHILE_NOT_ERROR b
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indent10( generateLoop( "stack[stack.length - 1] !== peg$FAILED" ) ),
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"",
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" case " + op.MATCH_ANY + ":", // MATCH_ANY a, f, ...
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indent10( generateCondition( "input.length > peg$currPos", 0 ) ),
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"",
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" case " + op.MATCH_STRING + ":", // MATCH_STRING s, a, f, ...
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indent10( generateCondition(
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"input.substr(peg$currPos, peg$consts[bc[ip + 1]].length) === peg$consts[bc[ip + 1]]",
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1
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) ),
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"",
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" case " + op.MATCH_STRING_IC + ":", // MATCH_STRING_IC s, a, f, ...
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indent10( generateCondition(
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"input.substr(peg$currPos, peg$consts[bc[ip + 1]].length).toLowerCase() === peg$consts[bc[ip + 1]]",
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1
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) ),
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"",
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" case " + op.MATCH_REGEXP + ":", // MATCH_REGEXP r, a, f, ...
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indent10( generateCondition(
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"peg$consts[bc[ip + 1]].test(input.charAt(peg$currPos))",
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1
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) ),
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"",
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" case " + op.ACCEPT_N + ":", // ACCEPT_N n
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" stack.push(input.substr(peg$currPos, bc[ip + 1]));",
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" peg$currPos += bc[ip + 1];",
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" ip += 2;",
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" break;",
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"",
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" case " + op.ACCEPT_STRING + ":", // ACCEPT_STRING s
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" stack.push(peg$consts[bc[ip + 1]]);",
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" peg$currPos += peg$consts[bc[ip + 1]].length;",
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" ip += 2;",
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" break;",
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"",
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" case " + op.FAIL + ":", // FAIL e
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" stack.push(peg$FAILED);",
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" if (peg$silentFails === 0) {",
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" peg$fail(peg$consts[bc[ip + 1]]);",
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" }",
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" ip += 2;",
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" break;",
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"",
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" case " + op.LOAD_SAVED_POS + ":", // LOAD_SAVED_POS p
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" peg$savedPos = stack[stack.length - 1 - bc[ip + 1]];",
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" ip += 2;",
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" break;",
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"",
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" case " + op.UPDATE_SAVED_POS + ":", // UPDATE_SAVED_POS
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" peg$savedPos = peg$currPos;",
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" ip++;",
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" break;",
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"",
|
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" case " + op.CALL + ":", // CALL f, n, pc, p1, p2, ..., pN
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indent10( generateCall() ),
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"",
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" case " + op.RULE + ":", // RULE r
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" stack.push(peg$parseRule(bc[ip + 1]));",
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" ip += 2;",
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" break;",
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"",
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" case " + op.SILENT_FAILS_ON + ":", // SILENT_FAILS_ON
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" peg$silentFails++;",
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" ip++;",
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" break;",
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"",
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" case " + op.SILENT_FAILS_OFF + ":", // SILENT_FAILS_OFF
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" peg$silentFails--;",
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" ip++;",
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" break;",
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"",
|
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" // istanbul ignore next",
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" default:",
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" throw new Error(\"Invalid opcode: \" + bc[ip] + \".\");",
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" }",
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" }",
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"",
|
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" if (ends.length > 0) {",
|
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" end = ends.pop();",
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" ip = ips.pop();",
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" } else {",
|
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" break;",
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" }",
|
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" }"
|
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].join( "\n" ) );
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parts.push( indent2( generateRuleFooter( "peg$ruleNames[index]", "stack[0]" ) ) );
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parts.push( "}" );
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return parts.join( "\n" );
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}
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function generateRuleFunction( rule ) {
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const parts = [];
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const stackVars = [];
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function c( i ) {
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return "peg$c" + i;
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} // |consts[i]| of the abstract machine
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function s( i ) {
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return "s" + i;
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} // |stack[i]| of the abstract machine
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const stack = {
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sp: -1,
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maxSp: -1,
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push( exprCode ) {
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const code = s( ++this.sp ) + " = " + exprCode + ";";
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if ( this.sp > this.maxSp ) this.maxSp = this.sp;
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return code;
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},
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pop( n ) {
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if ( typeof n === "undefined" ) return s( this.sp-- );
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const values = Array( n );
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for ( let i = 0; i < n; i++ ) {
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values[ i ] = s( this.sp - n + 1 + i );
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}
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this.sp -= n;
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return values;
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},
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top() {
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|
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return s( this.sp );
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},
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index( i ) {
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return s( this.sp - i );
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}
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};
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|
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function compile( bc ) {
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let ip = 0;
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const end = bc.length;
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const parts = [];
|
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let value;
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|
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function compileCondition( cond, argCount ) {
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|
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const baseLength = argCount + 3;
|
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const thenLength = bc[ ip + baseLength - 2 ];
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const elseLength = bc[ ip + baseLength - 1 ];
|
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const baseSp = stack.sp;
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let thenCode, elseCode, thenSp, elseSp;
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|
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ip += baseLength;
|
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thenCode = compile( bc.slice( ip, ip + thenLength ) );
|
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thenSp = stack.sp;
|
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ip += thenLength;
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if ( elseLength > 0 ) {
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stack.sp = baseSp;
|
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elseCode = compile( bc.slice( ip, ip + elseLength ) );
|
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elseSp = stack.sp;
|
|
ip += elseLength;
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|
|
|
// istanbul ignore if
|
|
if ( thenSp !== elseSp ) {
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|
|
throw new Error(
|
|
"Branches of a condition must move the stack pointer in the same way."
|
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);
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|
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}
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|
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}
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|
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parts.push( "if (" + cond + ") {" );
|
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parts.push( indent2( thenCode ) );
|
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if ( elseLength > 0 ) {
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|
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parts.push( "} else {" );
|
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parts.push( indent2( elseCode ) );
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|
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}
|
|
parts.push( "}" );
|
|
|
|
}
|
|
|
|
function compileLoop( cond ) {
|
|
|
|
const baseLength = 2;
|
|
const bodyLength = bc[ ip + baseLength - 1 ];
|
|
const baseSp = stack.sp;
|
|
let bodyCode, bodySp;
|
|
|
|
ip += baseLength;
|
|
bodyCode = compile( bc.slice( ip, ip + bodyLength ) );
|
|
bodySp = stack.sp;
|
|
ip += bodyLength;
|
|
|
|
// istanbul ignore if
|
|
if ( bodySp !== baseSp ) {
|
|
|
|
throw new Error( "Body of a loop can't move the stack pointer." );
|
|
|
|
}
|
|
|
|
parts.push( "while (" + cond + ") {" );
|
|
parts.push( indent2( bodyCode ) );
|
|
parts.push( "}" );
|
|
|
|
}
|
|
|
|
function compileCall() {
|
|
|
|
const baseLength = 4;
|
|
const paramsLength = bc[ ip + baseLength - 1 ];
|
|
|
|
const value = c( bc[ ip + 1 ] )
|
|
+ "("
|
|
+ bc
|
|
.slice( ip + baseLength, ip + baseLength + paramsLength )
|
|
.map( p => stack.index( p ) )
|
|
.join( ", " )
|
|
+ ")";
|
|
|
|
stack.pop( bc[ ip + 2 ] );
|
|
parts.push( stack.push( value ) );
|
|
ip += baseLength + paramsLength;
|
|
|
|
}
|
|
|
|
while ( ip < end ) {
|
|
|
|
switch ( bc[ ip ] ) {
|
|
|
|
case op.PUSH: // PUSH c
|
|
parts.push( stack.push( c( bc[ ip + 1 ] ) ) );
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.PUSH_CURR_POS: // PUSH_CURR_POS
|
|
parts.push( stack.push( "peg$currPos" ) );
|
|
ip++;
|
|
break;
|
|
|
|
case op.PUSH_UNDEFINED: // PUSH_UNDEFINED
|
|
parts.push( stack.push( "undefined" ) );
|
|
ip++;
|
|
break;
|
|
|
|
case op.PUSH_NULL: // PUSH_NULL
|
|
parts.push( stack.push( "null" ) );
|
|
ip++;
|
|
break;
|
|
|
|
case op.PUSH_FAILED: // PUSH_FAILED
|
|
parts.push( stack.push( "peg$FAILED" ) );
|
|
ip++;
|
|
break;
|
|
|
|
case op.PUSH_EMPTY_ARRAY: // PUSH_EMPTY_ARRAY
|
|
parts.push( stack.push( "[]" ) );
|
|
ip++;
|
|
break;
|
|
|
|
case op.POP: // POP
|
|
stack.pop();
|
|
ip++;
|
|
break;
|
|
|
|
case op.POP_CURR_POS: // POP_CURR_POS
|
|
parts.push( "peg$currPos = " + stack.pop() + ";" );
|
|
ip++;
|
|
break;
|
|
|
|
case op.POP_N: // POP_N n
|
|
stack.pop( bc[ ip + 1 ] );
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.NIP: // NIP
|
|
value = stack.pop();
|
|
stack.pop();
|
|
parts.push( stack.push( value ) );
|
|
ip++;
|
|
break;
|
|
|
|
case op.APPEND: // APPEND
|
|
value = stack.pop();
|
|
parts.push( stack.top() + ".push(" + value + ");" );
|
|
ip++;
|
|
break;
|
|
|
|
case op.WRAP: // WRAP n
|
|
parts.push(
|
|
stack.push( "[" + stack.pop( bc[ ip + 1 ] ).join( ", " ) + "]" )
|
|
);
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.TEXT: // TEXT
|
|
parts.push(
|
|
stack.push( "input.substring(" + stack.pop() + ", peg$currPos)" )
|
|
);
|
|
ip++;
|
|
break;
|
|
|
|
case op.IF: // IF t, f
|
|
compileCondition( stack.top(), 0 );
|
|
break;
|
|
|
|
case op.IF_ERROR: // IF_ERROR t, f
|
|
compileCondition( stack.top() + " === peg$FAILED", 0 );
|
|
break;
|
|
|
|
case op.IF_NOT_ERROR: // IF_NOT_ERROR t, f
|
|
compileCondition( stack.top() + " !== peg$FAILED", 0 );
|
|
break;
|
|
|
|
case op.WHILE_NOT_ERROR: // WHILE_NOT_ERROR b
|
|
compileLoop( stack.top() + " !== peg$FAILED", 0 );
|
|
break;
|
|
|
|
case op.MATCH_ANY: // MATCH_ANY a, f, ...
|
|
compileCondition( "input.length > peg$currPos", 0 );
|
|
break;
|
|
|
|
case op.MATCH_STRING: // MATCH_STRING s, a, f, ...
|
|
compileCondition(
|
|
eval( ast.consts[ bc[ ip + 1 ] ] ).length > 1
|
|
? "input.substr(peg$currPos, "
|
|
+ eval( ast.consts[ bc[ ip + 1 ] ] ).length
|
|
+ ") === "
|
|
+ c( bc[ ip + 1 ] )
|
|
: "input.charCodeAt(peg$currPos) === "
|
|
+ eval( ast.consts[ bc[ ip + 1 ] ] ).charCodeAt( 0 )
|
|
, 1
|
|
);
|
|
break;
|
|
|
|
case op.MATCH_STRING_IC: // MATCH_STRING_IC s, a, f, ...
|
|
compileCondition(
|
|
"input.substr(peg$currPos, "
|
|
+ eval( ast.consts[ bc[ ip + 1 ] ] ).length
|
|
+ ").toLowerCase() === "
|
|
+ c( bc[ ip + 1 ] )
|
|
, 1
|
|
);
|
|
break;
|
|
|
|
case op.MATCH_REGEXP: // MATCH_REGEXP r, a, f, ...
|
|
compileCondition( c( bc[ ip + 1 ] ) + ".test(input.charAt(peg$currPos))", 1 );
|
|
break;
|
|
|
|
case op.ACCEPT_N: // ACCEPT_N n
|
|
parts.push( stack.push(
|
|
bc[ ip + 1 ] > 1
|
|
? "input.substr(peg$currPos, " + bc[ ip + 1 ] + ")"
|
|
: "input.charAt(peg$currPos)"
|
|
) );
|
|
parts.push(
|
|
bc[ ip + 1 ] > 1
|
|
? "peg$currPos += " + bc[ ip + 1 ] + ";"
|
|
: "peg$currPos++;"
|
|
);
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.ACCEPT_STRING: // ACCEPT_STRING s
|
|
parts.push( stack.push( c( bc[ ip + 1 ] ) ) );
|
|
parts.push(
|
|
eval( ast.consts[ bc[ ip + 1 ] ] ).length > 1
|
|
? "peg$currPos += " + eval( ast.consts[ bc[ ip + 1 ] ] ).length + ";"
|
|
: "peg$currPos++;"
|
|
);
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.FAIL: // FAIL e
|
|
parts.push( stack.push( "peg$FAILED" ) );
|
|
parts.push( "if (peg$silentFails === 0) { peg$fail(" + c( bc[ ip + 1 ] ) + "); }" );
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.LOAD_SAVED_POS: // LOAD_SAVED_POS p
|
|
parts.push( "peg$savedPos = " + stack.index( bc[ ip + 1 ] ) + ";" );
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.UPDATE_SAVED_POS: // UPDATE_SAVED_POS
|
|
parts.push( "peg$savedPos = peg$currPos;" );
|
|
ip++;
|
|
break;
|
|
|
|
case op.CALL: // CALL f, n, pc, p1, p2, ..., pN
|
|
compileCall();
|
|
break;
|
|
|
|
case op.RULE: // RULE r
|
|
parts.push( stack.push( "peg$parse" + ast.rules[ bc[ ip + 1 ] ].name + "()" ) );
|
|
ip += 2;
|
|
break;
|
|
|
|
case op.SILENT_FAILS_ON: // SILENT_FAILS_ON
|
|
parts.push( "peg$silentFails++;" );
|
|
ip++;
|
|
break;
|
|
|
|
case op.SILENT_FAILS_OFF: // SILENT_FAILS_OFF
|
|
parts.push( "peg$silentFails--;" );
|
|
ip++;
|
|
break;
|
|
|
|
// istanbul ignore next
|
|
default:
|
|
throw new Error( "Invalid opcode: " + bc[ ip ] + "." );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return parts.join( "\n" );
|
|
|
|
}
|
|
|
|
const code = compile( rule.bytecode );
|
|
|
|
parts.push( "function peg$parse" + rule.name + "() {" );
|
|
|
|
if ( options.trace ) {
|
|
|
|
parts.push( " var startPos = peg$currPos;" );
|
|
|
|
}
|
|
|
|
for ( let i = 0; i <= stack.maxSp; i++ ) {
|
|
|
|
stackVars[ i ] = s( i );
|
|
|
|
}
|
|
|
|
parts.push( " var " + stackVars.join( ", " ) + ";" );
|
|
|
|
parts.push( indent2( generateRuleHeader(
|
|
"\"" + js.stringEscape( rule.name ) + "\"",
|
|
asts.indexOfRule( ast, rule.name )
|
|
) ) );
|
|
parts.push( indent2( code ) );
|
|
parts.push( indent2( generateRuleFooter(
|
|
"\"" + js.stringEscape( rule.name ) + "\"",
|
|
s( 0 )
|
|
) ) );
|
|
|
|
parts.push( "}" );
|
|
|
|
return parts.join( "\n" );
|
|
|
|
}
|
|
|
|
function generateToplevel() {
|
|
|
|
const parts = [];
|
|
|
|
parts.push( [
|
|
"function peg$subclass(child, parent) {",
|
|
" function C() { this.constructor = child; }",
|
|
" C.prototype = parent.prototype;",
|
|
" child.prototype = new C();",
|
|
"}",
|
|
"",
|
|
"function peg$SyntaxError(message, expected, found, location) {",
|
|
" this.message = message;",
|
|
" this.expected = expected;",
|
|
" this.found = found;",
|
|
" this.location = location;",
|
|
" this.name = \"SyntaxError\";",
|
|
"",
|
|
" // istanbul ignore next",
|
|
" if (typeof Error.captureStackTrace === \"function\") {",
|
|
" Error.captureStackTrace(this, peg$SyntaxError);",
|
|
" }",
|
|
"}",
|
|
"",
|
|
"peg$subclass(peg$SyntaxError, Error);",
|
|
"",
|
|
"peg$SyntaxError.buildMessage = function(expected, found) {",
|
|
" var DESCRIBE_EXPECTATION_FNS = {",
|
|
" literal: function(expectation) {",
|
|
" return \"\\\"\" + literalEscape(expectation.text) + \"\\\"\";",
|
|
" },",
|
|
"",
|
|
" class: function(expectation) {",
|
|
" var escapedParts = expectation.parts.map(function(part) {",
|
|
" return Array.isArray(part)",
|
|
" ? classEscape(part[0]) + \"-\" + classEscape(part[1])",
|
|
" : classEscape(part);",
|
|
" });",
|
|
"",
|
|
" return \"[\" + (expectation.inverted ? \"^\" : \"\") + escapedParts + \"]\";",
|
|
" },",
|
|
"",
|
|
" any: function() {",
|
|
" return \"any character\";",
|
|
" },",
|
|
"",
|
|
" end: function() {",
|
|
" return \"end of input\";",
|
|
" },",
|
|
"",
|
|
" other: function(expectation) {",
|
|
" return expectation.description;",
|
|
" }",
|
|
" };",
|
|
"",
|
|
" function hex(ch) {",
|
|
" return ch.charCodeAt(0).toString(16).toUpperCase();",
|
|
" }",
|
|
"",
|
|
" function literalEscape(s) {",
|
|
" return s",
|
|
" .replace(/\\\\/g, \"\\\\\\\\\")", // backslash
|
|
" .replace(/\"/g, \"\\\\\\\"\")", // closing double quote
|
|
" .replace(/\\0/g, \"\\\\0\")", // null
|
|
" .replace(/\\t/g, \"\\\\t\")", // horizontal tab
|
|
" .replace(/\\n/g, \"\\\\n\")", // line feed
|
|
" .replace(/\\r/g, \"\\\\r\")", // carriage return
|
|
" .replace(/[\\x00-\\x0F]/g, function(ch) { return \"\\\\x0\" + hex(ch); })",
|
|
" .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return \"\\\\x\" + hex(ch); });",
|
|
" }",
|
|
"",
|
|
" function classEscape(s) {",
|
|
" return s",
|
|
" .replace(/\\\\/g, \"\\\\\\\\\")", // backslash
|
|
" .replace(/\\]/g, \"\\\\]\")", // closing bracket
|
|
" .replace(/\\^/g, \"\\\\^\")", // caret
|
|
" .replace(/-/g, \"\\\\-\")", // dash
|
|
" .replace(/\\0/g, \"\\\\0\")", // null
|
|
" .replace(/\\t/g, \"\\\\t\")", // horizontal tab
|
|
" .replace(/\\n/g, \"\\\\n\")", // line feed
|
|
" .replace(/\\r/g, \"\\\\r\")", // carriage return
|
|
" .replace(/[\\x00-\\x0F]/g, function(ch) { return \"\\\\x0\" + hex(ch); })",
|
|
" .replace(/[\\x10-\\x1F\\x7F-\\x9F]/g, function(ch) { return \"\\\\x\" + hex(ch); });",
|
|
" }",
|
|
"",
|
|
" function describeExpectation(expectation) {",
|
|
" return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);",
|
|
" }",
|
|
"",
|
|
" function describeExpected(expected) {",
|
|
" var descriptions = expected.map(describeExpectation);",
|
|
" var i, j;",
|
|
"",
|
|
" descriptions.sort();",
|
|
"",
|
|
" if (descriptions.length > 0) {",
|
|
" for (i = 1, j = 1; i < descriptions.length; i++) {",
|
|
" if (descriptions[i - 1] !== descriptions[i]) {",
|
|
" descriptions[j] = descriptions[i];",
|
|
" j++;",
|
|
" }",
|
|
" }",
|
|
" descriptions.length = j;",
|
|
" }",
|
|
"",
|
|
" switch (descriptions.length) {",
|
|
" case 1:",
|
|
" return descriptions[0];",
|
|
"",
|
|
" case 2:",
|
|
" return descriptions[0] + \" or \" + descriptions[1];",
|
|
"",
|
|
" default:",
|
|
" return descriptions.slice(0, -1).join(\", \")",
|
|
" + \", or \"",
|
|
" + descriptions[descriptions.length - 1];",
|
|
" }",
|
|
" }",
|
|
"",
|
|
" function describeFound(found) {",
|
|
" return found ? \"\\\"\" + literalEscape(found) + \"\\\"\" : \"end of input\";",
|
|
" }",
|
|
"",
|
|
" return \"Expected \" + describeExpected(expected) + \" but \" + describeFound(found) + \" found.\";",
|
|
"};",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
if ( options.trace ) {
|
|
|
|
parts.push( [
|
|
"function peg$DefaultTracer() {",
|
|
" this.indentLevel = 0;",
|
|
"}",
|
|
"",
|
|
"peg$DefaultTracer.prototype.trace = function(event) {",
|
|
" var that = this;",
|
|
"",
|
|
" function log(event) {",
|
|
" function repeat(string, n) {",
|
|
" var result = \"\", i;",
|
|
"",
|
|
" for (i = 0; i < n; i++) {",
|
|
" result += string;",
|
|
" }",
|
|
"",
|
|
" return result;",
|
|
" }",
|
|
"",
|
|
" function pad(string, length) {",
|
|
" return string + repeat(\" \", length - string.length);",
|
|
" }",
|
|
"",
|
|
" if (typeof console === \"object\") {", // IE 8-10
|
|
" console.log(",
|
|
" event.location.start.line + \":\" + event.location.start.column + \"-\"",
|
|
" + event.location.end.line + \":\" + event.location.end.column + \" \"",
|
|
" + pad(event.type, 10) + \" \"",
|
|
" + repeat(\" \", that.indentLevel) + event.rule",
|
|
" );",
|
|
" }",
|
|
" }",
|
|
"",
|
|
" switch (event.type) {",
|
|
" case \"rule.enter\":",
|
|
" log(event);",
|
|
" this.indentLevel++;",
|
|
" break;",
|
|
"",
|
|
" case \"rule.match\":",
|
|
" this.indentLevel--;",
|
|
" log(event);",
|
|
" break;",
|
|
"",
|
|
" case \"rule.fail\":",
|
|
" this.indentLevel--;",
|
|
" log(event);",
|
|
" break;",
|
|
"",
|
|
" // istanbul ignore next",
|
|
" default:",
|
|
" throw new Error(\"Invalid event type: \" + event.type + \".\");",
|
|
" }",
|
|
"};",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
"function peg$parse(input, options) {",
|
|
" options = options !== undefined ? options : {};",
|
|
"",
|
|
" var peg$FAILED = {};",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
if ( options.optimize === "size" ) {
|
|
|
|
const startRuleIndices = "{ "
|
|
+ options.allowedStartRules
|
|
.map( r => r + ": " + asts.indexOfRule( ast, r ) )
|
|
.join( ", " )
|
|
+ " }";
|
|
const startRuleIndex = asts.indexOfRule( ast, options.allowedStartRules[ 0 ] );
|
|
|
|
parts.push( [
|
|
" var peg$startRuleIndices = " + startRuleIndices + ";",
|
|
" var peg$startRuleIndex = " + startRuleIndex + ";"
|
|
].join( "\n" ) );
|
|
|
|
} else {
|
|
|
|
const startRuleFunctions = "{ "
|
|
+ options.allowedStartRules
|
|
.map( r => r + ": peg$parse" + r )
|
|
.join( ", " )
|
|
+ " }";
|
|
const startRuleFunction = "peg$parse" + options.allowedStartRules[ 0 ];
|
|
|
|
parts.push( [
|
|
" var peg$startRuleFunctions = " + startRuleFunctions + ";",
|
|
" var peg$startRuleFunction = " + startRuleFunction + ";"
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
parts.push( "" );
|
|
|
|
parts.push( indent2( generateTables() ) );
|
|
|
|
parts.push( [
|
|
"",
|
|
" var peg$currPos = 0;",
|
|
" var peg$savedPos = 0;",
|
|
" var peg$posDetailsCache = [{ line: 1, column: 1 }];",
|
|
" var peg$maxFailPos = 0;",
|
|
" var peg$maxFailExpected = [];",
|
|
" var peg$silentFails = 0;", // 0 = report failures, > 0 = silence failures
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
if ( options.cache ) {
|
|
|
|
parts.push( [
|
|
" var peg$resultsCache = {};",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
if ( options.trace ) {
|
|
|
|
if ( options.optimize === "size" ) {
|
|
|
|
const ruleNames = "["
|
|
+ ast.rules
|
|
.map( r => `"${ js.stringEscape( r.name ) }"` )
|
|
.join( ", " )
|
|
+ "]";
|
|
|
|
parts.push( [
|
|
" var peg$ruleNames = " + ruleNames + ";",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
" var peg$tracer = \"tracer\" in options ? options.tracer : new peg$DefaultTracer();",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
" var peg$result;",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
if ( options.optimize === "size" ) {
|
|
|
|
parts.push( [
|
|
" if (\"startRule\" in options) {",
|
|
" if (!(options.startRule in peg$startRuleIndices)) {",
|
|
" throw new Error(\"Can't start parsing from rule \\\"\" + options.startRule + \"\\\".\");",
|
|
" }",
|
|
"",
|
|
" peg$startRuleIndex = peg$startRuleIndices[options.startRule];",
|
|
" }"
|
|
].join( "\n" ) );
|
|
|
|
} else {
|
|
|
|
parts.push( [
|
|
" if (\"startRule\" in options) {",
|
|
" if (!(options.startRule in peg$startRuleFunctions)) {",
|
|
" throw new Error(\"Can't start parsing from rule \\\"\" + options.startRule + \"\\\".\");",
|
|
" }",
|
|
"",
|
|
" peg$startRuleFunction = peg$startRuleFunctions[options.startRule];",
|
|
" }"
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
"",
|
|
" function text() {",
|
|
" return input.substring(peg$savedPos, peg$currPos);",
|
|
" }",
|
|
"",
|
|
" function offset() {",
|
|
" return peg$savedPos;",
|
|
" }",
|
|
"",
|
|
" function range() {",
|
|
" return [peg$savedPos, peg$currPos];",
|
|
" }",
|
|
"",
|
|
" function location() {",
|
|
" return peg$computeLocation(peg$savedPos, peg$currPos);",
|
|
" }",
|
|
"",
|
|
" function expected(description, location) {",
|
|
" location = location !== undefined",
|
|
" ? location",
|
|
" : peg$computeLocation(peg$savedPos, peg$currPos);",
|
|
"",
|
|
" throw peg$buildStructuredError(",
|
|
" [peg$otherExpectation(description)],",
|
|
" input.substring(peg$savedPos, peg$currPos),",
|
|
" location",
|
|
" );",
|
|
" }",
|
|
"",
|
|
" function error(message, location) {",
|
|
" location = location !== undefined",
|
|
" ? location",
|
|
" : peg$computeLocation(peg$savedPos, peg$currPos);",
|
|
"",
|
|
" throw peg$buildSimpleError(message, location);",
|
|
" }",
|
|
"",
|
|
" function peg$literalExpectation(text, ignoreCase) {",
|
|
" return { type: \"literal\", text: text, ignoreCase: ignoreCase };",
|
|
" }",
|
|
"",
|
|
" function peg$classExpectation(parts, inverted, ignoreCase) {",
|
|
" return { type: \"class\", parts: parts, inverted: inverted, ignoreCase: ignoreCase };",
|
|
" }",
|
|
"",
|
|
" function peg$anyExpectation() {",
|
|
" return { type: \"any\" };",
|
|
" }",
|
|
"",
|
|
" function peg$endExpectation() {",
|
|
" return { type: \"end\" };",
|
|
" }",
|
|
"",
|
|
" function peg$otherExpectation(description) {",
|
|
" return { type: \"other\", description: description };",
|
|
" }",
|
|
"",
|
|
" function peg$computePosDetails(pos) {",
|
|
" var details = peg$posDetailsCache[pos];",
|
|
" var p;",
|
|
"",
|
|
" if (details) {",
|
|
" return details;",
|
|
" } else {",
|
|
" p = pos - 1;",
|
|
" while (!peg$posDetailsCache[p]) {",
|
|
" p--;",
|
|
" }",
|
|
"",
|
|
" details = peg$posDetailsCache[p];",
|
|
" details = {",
|
|
" line: details.line,",
|
|
" column: details.column",
|
|
" };",
|
|
"",
|
|
" while (p < pos) {",
|
|
" if (input.charCodeAt(p) === 10) {",
|
|
" details.line++;",
|
|
" details.column = 1;",
|
|
" } else {",
|
|
" details.column++;",
|
|
" }",
|
|
"",
|
|
" p++;",
|
|
" }",
|
|
"",
|
|
" peg$posDetailsCache[pos] = details;",
|
|
"",
|
|
" return details;",
|
|
" }",
|
|
" }",
|
|
"",
|
|
" function peg$computeLocation(startPos, endPos) {",
|
|
" var startPosDetails = peg$computePosDetails(startPos);",
|
|
" var endPosDetails = peg$computePosDetails(endPos);",
|
|
"",
|
|
" return {",
|
|
" start: {",
|
|
" offset: startPos,",
|
|
" line: startPosDetails.line,",
|
|
" column: startPosDetails.column",
|
|
" },",
|
|
" end: {",
|
|
" offset: endPos,",
|
|
" line: endPosDetails.line,",
|
|
" column: endPosDetails.column",
|
|
" }",
|
|
" };",
|
|
" }",
|
|
"",
|
|
" function peg$fail(expected) {",
|
|
" if (peg$currPos < peg$maxFailPos) { return; }",
|
|
"",
|
|
" if (peg$currPos > peg$maxFailPos) {",
|
|
" peg$maxFailPos = peg$currPos;",
|
|
" peg$maxFailExpected = [];",
|
|
" }",
|
|
"",
|
|
" peg$maxFailExpected.push(expected);",
|
|
" }",
|
|
"",
|
|
" function peg$buildSimpleError(message, location) {",
|
|
" return new peg$SyntaxError(message, null, null, location);",
|
|
" }",
|
|
"",
|
|
" function peg$buildStructuredError(expected, found, location) {",
|
|
" return new peg$SyntaxError(",
|
|
" peg$SyntaxError.buildMessage(expected, found),",
|
|
" expected,",
|
|
" found,",
|
|
" location",
|
|
" );",
|
|
" }",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
if ( options.optimize === "size" ) {
|
|
|
|
parts.push( indent2( generateInterpreter() ) );
|
|
parts.push( "" );
|
|
|
|
} else {
|
|
|
|
ast.rules.forEach( rule => {
|
|
|
|
parts.push( indent2( generateRuleFunction( rule ) ) );
|
|
parts.push( "" );
|
|
|
|
} );
|
|
|
|
}
|
|
|
|
if ( ast.initializer ) {
|
|
|
|
parts.push( indent2( ast.initializer.code ) );
|
|
parts.push( "" );
|
|
|
|
}
|
|
|
|
if ( options.optimize === "size" ) {
|
|
|
|
parts.push( " peg$result = peg$parseRule(peg$startRuleIndex);" );
|
|
|
|
} else {
|
|
|
|
parts.push( " peg$result = peg$startRuleFunction();" );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
"",
|
|
" if (peg$result !== peg$FAILED && peg$currPos === input.length) {",
|
|
" return peg$result;",
|
|
" } else {",
|
|
" if (peg$result !== peg$FAILED && peg$currPos < input.length) {",
|
|
" peg$fail(peg$endExpectation());",
|
|
" }",
|
|
"",
|
|
" throw peg$buildStructuredError(",
|
|
" peg$maxFailExpected,",
|
|
" peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,",
|
|
" peg$maxFailPos < input.length",
|
|
" ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)",
|
|
" : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)",
|
|
" );",
|
|
" }",
|
|
"}"
|
|
].join( "\n" ) );
|
|
|
|
return parts.join( "\n" );
|
|
|
|
}
|
|
|
|
function generateWrapper( toplevelCode ) {
|
|
|
|
function generateHeaderComment() {
|
|
|
|
let comment = "// Generated by PEG.js v0.11.0-dev, https://pegjs.org/";
|
|
const header = options.header;
|
|
|
|
if ( typeof header === "string" ) {
|
|
|
|
comment += "\n\n" + header;
|
|
|
|
} else if ( Array.isArray( header ) ) {
|
|
|
|
comment += "\n\n";
|
|
header.forEach( data => {
|
|
|
|
comment += "// " + data;
|
|
|
|
} );
|
|
|
|
}
|
|
|
|
return comment;
|
|
|
|
}
|
|
|
|
function generateParserObject() {
|
|
|
|
return options.trace
|
|
? [
|
|
"{",
|
|
" SyntaxError: peg$SyntaxError,",
|
|
" DefaultTracer: peg$DefaultTracer,",
|
|
" parse: peg$parse",
|
|
"}"
|
|
].join( "\n" )
|
|
: [
|
|
"{",
|
|
" SyntaxError: peg$SyntaxError,",
|
|
" parse: peg$parse",
|
|
"}"
|
|
].join( "\n" );
|
|
|
|
}
|
|
|
|
function generateParserExports() {
|
|
|
|
return options.trace
|
|
? [
|
|
"{",
|
|
" peg$SyntaxError as SyntaxError,",
|
|
" peg$DefaultTracer as DefaultTracer,",
|
|
" peg$parse as parse",
|
|
"}"
|
|
].join( "\n" )
|
|
: [
|
|
"{",
|
|
" peg$SyntaxError as SyntaxError,",
|
|
" peg$parse as parse",
|
|
"}"
|
|
].join( "\n" );
|
|
|
|
}
|
|
|
|
const generators = {
|
|
bare() {
|
|
|
|
return [
|
|
generateHeaderComment(),
|
|
"(function() {",
|
|
" \"use strict\";",
|
|
"",
|
|
indent2( toplevelCode ),
|
|
"",
|
|
indent2( "return " + generateParserObject() + ";" ),
|
|
"})()"
|
|
].join( "\n" );
|
|
|
|
},
|
|
|
|
commonjs() {
|
|
|
|
const parts = [];
|
|
const dependencyVars = Object.keys( options.dependencies );
|
|
|
|
parts.push( [
|
|
generateHeaderComment(),
|
|
"",
|
|
"\"use strict\";",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
if ( dependencyVars.length > 0 ) {
|
|
|
|
dependencyVars.forEach( variable => {
|
|
|
|
parts.push( "var " + variable
|
|
+ " = require(\""
|
|
+ js.stringEscape( options.dependencies[ variable ] )
|
|
+ "\");"
|
|
);
|
|
|
|
} );
|
|
parts.push( "" );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
toplevelCode,
|
|
"",
|
|
"module.exports = " + generateParserObject() + ";",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
return parts.join( "\n" );
|
|
|
|
},
|
|
|
|
es() {
|
|
|
|
const parts = [];
|
|
const dependencyVars = Object.keys( options.dependencies );
|
|
|
|
parts.push(
|
|
generateHeaderComment(),
|
|
""
|
|
);
|
|
|
|
if ( dependencyVars.length > 0 ) {
|
|
|
|
dependencyVars.forEach( variable => {
|
|
|
|
parts.push( "import " + variable
|
|
+ " from \""
|
|
+ js.stringEscape( options.dependencies[ variable ] )
|
|
+ "\";"
|
|
);
|
|
|
|
} );
|
|
parts.push( "" );
|
|
|
|
}
|
|
|
|
parts.push(
|
|
toplevelCode,
|
|
"",
|
|
"export " + generateParserExports() + ";",
|
|
"",
|
|
"export default " + generateParserObject() + ";",
|
|
""
|
|
);
|
|
|
|
return parts.join( "\n" );
|
|
|
|
},
|
|
|
|
amd() {
|
|
|
|
const dependencyVars = Object.keys( options.dependencies );
|
|
const dependencyIds = dependencyVars.map( v => options.dependencies[ v ] );
|
|
const dependencies = "["
|
|
+ dependencyIds
|
|
.map( id => `"${ js.stringEscape( id ) }"` )
|
|
.join( ", " )
|
|
+ "]";
|
|
const params = dependencyVars.join( ", " );
|
|
|
|
return [
|
|
generateHeaderComment(),
|
|
"define(" + dependencies + ", function(" + params + ") {",
|
|
" \"use strict\";",
|
|
"",
|
|
indent2( toplevelCode ),
|
|
"",
|
|
indent2( "return " + generateParserObject() + ";" ),
|
|
"});",
|
|
""
|
|
].join( "\n" );
|
|
|
|
},
|
|
|
|
globals() {
|
|
|
|
return [
|
|
generateHeaderComment(),
|
|
"(function(root) {",
|
|
" \"use strict\";",
|
|
"",
|
|
indent2( toplevelCode ),
|
|
"",
|
|
indent2( "root." + options.exportVar + " = " + generateParserObject() + ";" ),
|
|
"})(this);",
|
|
""
|
|
].join( "\n" );
|
|
|
|
},
|
|
|
|
umd() {
|
|
|
|
const parts = [];
|
|
const dependencyVars = Object.keys( options.dependencies );
|
|
const dependencyIds = dependencyVars.map( v => options.dependencies[ v ] );
|
|
const dependencies = "["
|
|
+ dependencyIds
|
|
.map( id => `"${ js.stringEscape( id ) }"` )
|
|
.join( ", " )
|
|
+ "]";
|
|
const requires = dependencyIds
|
|
.map( id => `require("${ js.stringEscape( id ) }")` )
|
|
.join( ", " );
|
|
const params = dependencyVars.join( ", " );
|
|
|
|
parts.push( [
|
|
generateHeaderComment(),
|
|
"(function(root, factory) {",
|
|
" if (typeof define === \"function\" && define.amd) {",
|
|
" define(" + dependencies + ", factory);",
|
|
" } else if (typeof module === \"object\" && module.exports) {",
|
|
" module.exports = factory(" + requires + ");"
|
|
].join( "\n" ) );
|
|
|
|
if ( options.exportVar !== null ) {
|
|
|
|
parts.push( [
|
|
" } else {",
|
|
" root." + options.exportVar + " = factory();"
|
|
].join( "\n" ) );
|
|
|
|
}
|
|
|
|
parts.push( [
|
|
" }",
|
|
"})(this, function(" + params + ") {",
|
|
" \"use strict\";",
|
|
"",
|
|
indent2( toplevelCode ),
|
|
"",
|
|
indent2( "return " + generateParserObject() + ";" ),
|
|
"});",
|
|
""
|
|
].join( "\n" ) );
|
|
|
|
return parts.join( "\n" );
|
|
|
|
}
|
|
};
|
|
|
|
return generators[ options.format ]();
|
|
|
|
}
|
|
|
|
ast.code = generateWrapper( generateToplevel() );
|
|
|
|
}
|
|
|
|
module.exports = generateJS;
|