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234 | 1
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1
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1
| (function(sc) {
"use strict";
require("../compiler");
require("../marker/");
var slice = [].slice;
var strlib = sc.libs.strlib;
var charlib = sc.libs.charlib;
var Token = sc.lang.compiler.Token;
var Message = sc.lang.compiler.Message;
var Marker = sc.lang.compiler.Marker;
function Lexer(source, opts) {
/* istanbul ignore next */
if (typeof source !== "string") {
Eif (typeof source === "undefined") {
source = "";
}
source = String(source);
}
this.source = source.replace(/\r\n?/g, "\n");
this.opts = opts = opts || /* istanbul ignore next */ {};
this.length = source.length;
this.errors = null;
this.index = 0;
this.lineNumber = this.length ? 1 : 0;
this.lineStart = 0;
this.lookahead = this.advance();
this.index = 0;
this.lineNumber = this.length ? 1 : 0;
this.lineStart = 0;
}
Object.defineProperty(Lexer.prototype, "columnNumber", {
get: function() {
return this.index - this.lineStart;
}
});
Lexer.addLexMethod = function(name, method) {
Lexer.prototype["lex" + name] = method;
};
Lexer.prototype.tokenize = function() {
var tokens = [];
while (true) {
var token = this.collectToken();
if (token.type === Token.EOF) {
break;
}
tokens.push(token);
}
return tokens;
};
Lexer.prototype.collectToken = function() {
var token = this.advance();
var result = {
type: token.type,
value: token.value
};
if (this.opts.range) {
result.range = token.range;
}
if (this.opts.loc) {
result.loc = token.loc;
}
return result;
};
Lexer.prototype.lex = function() {
var token = this.lookahead;
this.index = token.range[1];
this.lineNumber = token.lineNumber;
this.lineStart = token.lineStart;
this.lookahead = this.advance();
this.index = token.range[1];
this.lineNumber = token.lineNumber;
this.lineStart = token.lineStart;
return token;
};
Lexer.prototype.unlex = function(token) {
this.lookahead = token;
this.index = token.range[0];
this.lineNumber = token.lineNumber;
this.lineStart = token.lineStart;
};
Lexer.prototype.advance = function() {
this.skipComment();
if (this.length <= this.index) {
return this.EOFToken();
}
var lineNumber = this.lineNumber;
var columnNumber = this.columnNumber;
var token = this.scan();
token.loc = {
start: { line: lineNumber, column: columnNumber },
end: { line: this.lineNumber, column: this.columnNumber }
};
return token;
};
Lexer.prototype.createMarker = function(node) {
return Marker.create(this, node);
};
Lexer.prototype.skipComment = function() {
var source = this.source;
var length = this.length;
while (this.index < length) {
var ch1 = source.charAt(this.index);
var ch2 = source.charAt(this.index + 1);
if (ch1 === " " || ch1 === "\t") {
this.index += 1;
} else if (ch1 === "\n") {
this.index += 1;
this.lineNumber += 1;
this.lineStart = this.index;
} else if (ch1 === "/" && (ch2 === "/" || ch2 === "*")) {
this.scanWithFunc(this.lexComment);
} else {
break;
}
}
};
Lexer.prototype.scan = function() {
return this.scanWithFunc(this.selectScanner());
};
Lexer.prototype.selectScanner = function() {
var ch = this.source.charAt(this.index);
if (ch === "\\" || ch === "'" || ch === '"' || ch === "$") {
return this.lexString;
}
if (ch === "_" || charlib.isAlpha(ch)) {
return this.lexIdentifier;
}
if (charlib.isNumber(ch)) {
return this.lexNumber;
}
return this.lexPunctuator;
};
Lexer.prototype.scanWithFunc = function(func) {
var start = this.index;
var token = func(this.source, this.index);
if (token.error) {
return this.throwError({}, Message.UnexpectedToken, token.value);
}
this.index += token.length;
if (token.line) {
var value = token.value;
this.lineStart = this.index - (value.length - value.lastIndexOf("\n") - 1);
this.lineNumber += token.line;
}
return this.makeToken(token.type, token.value, start);
};
Lexer.prototype.makeToken = function(type, value, start) {
return {
type: type,
value: value,
lineNumber: this.lineNumber,
lineStart: this.lineStart,
range: [ start, this.index ]
};
};
Lexer.prototype.EOFToken = function() {
return this.makeToken(Token.EOF, "<EOF>", this.index);
};
Lexer.prototype.getLocItems = function() {
return [ this.index, this.lineNumber, this.columnNumber ];
};
Lexer.prototype.throwError = function(token, messageFormat) {
var message = strlib.format(messageFormat, slice.call(arguments, 2));
var index, lineNumber, column;
if (typeof token.lineNumber === "number") {
index = token.range[0];
lineNumber = token.lineNumber;
column = token.range[0] - token.lineStart + 1;
} else {
index = this.index;
lineNumber = this.lineNumber;
column = index - this.lineStart + 1;
}
var error = new SyntaxError(
strlib.format("Line #{0}: #{1}", lineNumber, message),
null, // TODO: filename
lineNumber
);
error.index = index;
error.lineNumber = lineNumber;
error.column = column;
error.description = message;
throw error;
};
sc.lang.compiler.Lexer = Lexer;
})(sc);
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