2c067161df
Summary: Not true `\color`, but `\blue`, `\red`, etc. Test Plan: Add `\blue`, etc around stuff, see that it makes pretty colors appear. Reviewers: spicyj Reviewed By: spicyj Differential Revision: http://phabricator.benalpert.com/D44
81 lines
1.8 KiB
JavaScript
81 lines
1.8 KiB
JavaScript
function Lexer() {
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};
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var normals = [
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[/^[/|a-zA-Z0-9.]/, 'ORD'],
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[/^[*+-]/, 'BIN'],
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[/^\^/, '^'],
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[/^_/, '_'],
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[/^{/, '{'],
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[/^}/, '}'],
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[/^[(\[]/, 'OPEN'],
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[/^[)\]]/, 'CLOSE']
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];
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var funcs = [
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// Symbols
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'cdot', 'lvert', 'rvert', 'pm', 'div',
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// Colors
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'blue', 'orange', 'pink', 'red', 'green', 'gray', 'purple',
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// Other functions
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'dfrac'
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];
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var anyFunc = new RegExp("^\\\\(" + funcs.join("|") + ")(?![a-zA-Z])");
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Lexer.prototype.doMatch = function(match) {
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this.yytext = match;
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this.yyleng = match.length;
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this.yylloc.first_column = this._pos;
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this.yylloc.last_column = this._pos + match.length;
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this._pos += match.length;
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this._input = this._input.slice(match.length);
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};
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Lexer.prototype.lex = function() {
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// Get rid of whitespace
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var whitespace = this._input.match(/^\s*/)[0];
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this._pos += whitespace.length;
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this._input = this._input.slice(whitespace.length);
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if (this._input.length === 0) {
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return 'EOF';
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}
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var match;
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if ((match = this._input.match(anyFunc))) {
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this.doMatch(match[0]);
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return match[1];
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} else {
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for (var i = 0; i < normals.length; i++) {
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var normal = normals[i];
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if ((match = this._input.match(normal[0]))) {
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this.doMatch(match[0]);
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return normal[1];
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}
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}
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}
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throw "Unexpected character: '" + this._input[0] + "' at position " + this._pos;
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};
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Lexer.prototype.setInput = function(input) {
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this._input = input;
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this._pos = 0;
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this.yyleng = 0;
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this.yytext = "";
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this.yylineno = 0;
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this.yylloc = {
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first_line: 1,
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first_column: 0,
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last_line: 1,
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last_column: 0
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};
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};
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module.exports = new Lexer();
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