/* Copyright 2017 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.PostScriptParser = exports.PostScriptLexer = undefined;
var _util = require('../shared/util');
var _primitives = require('./primitives');
var PostScriptParser = function PostScriptParserClosure() {
function PostScriptParser(lexer) {
this.lexer = lexer;
this.operators = [];
this.token = null;
this.prev = null;
}
PostScriptParser.prototype = {
nextToken: function PostScriptParser_nextToken() {
this.prev = this.token;
this.token = this.lexer.getToken();
},
accept: function PostScriptParser_accept(type) {
if (this.token.type === type) {
this.nextToken();
return true;
}
return false;
},
expect: function PostScriptParser_expect(type) {
if (this.accept(type)) {
return true;
}
throw new _util.FormatError('Unexpected symbol: found ' + this.token.type + ' expected ' + type + '.');
},
parse: function PostScriptParser_parse() {
this.nextToken();
this.expect(PostScriptTokenTypes.LBRACE);
this.parseBlock();
this.expect(PostScriptTokenTypes.RBRACE);
return this.operators;
},
parseBlock: function PostScriptParser_parseBlock() {
while (true) {
if (this.accept(PostScriptTokenTypes.NUMBER)) {
this.operators.push(this.prev.value);
} else if (this.accept(PostScriptTokenTypes.OPERATOR)) {
this.operators.push(this.prev.value);
} else if (this.accept(PostScriptTokenTypes.LBRACE)) {
this.parseCondition();
} else {
return;
}
}
},
parseCondition: function PostScriptParser_parseCondition() {
var conditionLocation = this.operators.length;
this.operators.push(null, null);
this.parseBlock();
this.expect(PostScriptTokenTypes.RBRACE);
if (this.accept(PostScriptTokenTypes.IF)) {
this.operators[conditionLocation] = this.operators.length;
this.operators[conditionLocation + 1] = 'jz';
} else Eif (this.accept(PostScriptTokenTypes.LBRACE)) {
var jumpLocation = this.operators.length;
this.operators.push(null, null);
var endOfTrue = this.operators.length;
this.parseBlock();
this.expect(PostScriptTokenTypes.RBRACE);
this.expect(PostScriptTokenTypes.IFELSE);
this.operators[jumpLocation] = this.operators.length;
this.operators[jumpLocation + 1] = 'j';
this.operators[conditionLocation] = endOfTrue;
this.operators[conditionLocation + 1] = 'jz';
} else {
throw new _util.FormatError('PS Function: error parsing conditional.');
}
}
};
return PostScriptParser;
}();
var PostScriptTokenTypes = {
LBRACE: 0,
RBRACE: 1,
NUMBER: 2,
OPERATOR: 3,
IF: 4,
IFELSE: 5
};
var PostScriptToken = function PostScriptTokenClosure() {
function PostScriptToken(type, value) {
this.type = type;
this.value = value;
}
var opCache = Object.create(null);
PostScriptToken.getOperator = function PostScriptToken_getOperator(op) {
var opValue = opCache[op];
if (opValue) {
return opValue;
}
return opCache[op] = new PostScriptToken(PostScriptTokenTypes.OPERATOR, op);
};
PostScriptToken.LBRACE = new PostScriptToken(PostScriptTokenTypes.LBRACE, '{');
PostScriptToken.RBRACE = new PostScriptToken(PostScriptTokenTypes.RBRACE, '}');
PostScriptToken.IF = new PostScriptToken(PostScriptTokenTypes.IF, 'IF');
PostScriptToken.IFELSE = new PostScriptToken(PostScriptTokenTypes.IFELSE, 'IFELSE');
return PostScriptToken;
}();
var PostScriptLexer = function PostScriptLexerClosure() {
function PostScriptLexer(stream) {
this.stream = stream;
this.nextChar();
this.strBuf = [];
}
PostScriptLexer.prototype = {
nextChar: function PostScriptLexer_nextChar() {
return this.currentChar = this.stream.getByte();
},
getToken: function PostScriptLexer_getToken() {
var comment = false;
var ch = this.currentChar;
while (true) {
if (ch < 0) {
return _primitives.EOF;
}
Iif (comment) {
if (ch === 0x0A || ch === 0x0D) {
comment = false;
}
} else Iif (ch === 0x25) {
comment = true;
} else if (!(0, _util.isSpace)(ch)) {
break;
}
ch = this.nextChar();
}
switch (ch | 0) {
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
case 0x2B:
case 0x2D:
case 0x2E:
return new PostScriptToken(PostScriptTokenTypes.NUMBER, this.getNumber());
case 0x7B:
this.nextChar();
return PostScriptToken.LBRACE;
case 0x7D:
this.nextChar();
return PostScriptToken.RBRACE;
}
var strBuf = this.strBuf;
strBuf.length = 0;
strBuf[0] = String.fromCharCode(ch);
while ((ch = this.nextChar()) >= 0 && (ch >= 0x41 && ch <= 0x5A || ch >= 0x61 && ch <= 0x7A)) {
strBuf.push(String.fromCharCode(ch));
}
var str = strBuf.join('');
switch (str.toLowerCase()) {
case 'if':
return PostScriptToken.IF;
case 'ifelse':
return PostScriptToken.IFELSE;
default:
return PostScriptToken.getOperator(str);
}
},
getNumber: function PostScriptLexer_getNumber() {
var ch = this.currentChar;
var strBuf = this.strBuf;
strBuf.length = 0;
strBuf[0] = String.fromCharCode(ch);
while ((ch = this.nextChar()) >= 0) {
if (ch >= 0x30 && ch <= 0x39 || ch === 0x2D || ch === 0x2E) {
strBuf.push(String.fromCharCode(ch));
} else {
break;
}
}
var value = parseFloat(strBuf.join(''));
Iif (isNaN(value)) {
throw new _util.FormatError('Invalid floating point number: ' + value);
}
return value;
}
};
return PostScriptLexer;
}();
exports.PostScriptLexer = PostScriptLexer;
exports.PostScriptParser = PostScriptParser; |