101 lines
2.4 KiB
JavaScript
101 lines
2.4 KiB
JavaScript
function Lexer() {
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};
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var normals = [
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[/^[/|@."0-9]+/, 'TEXTORD'],
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[/^[`]/, 'TEXTORD'],
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[/^[a-zA-Z]+/, 'MATHORD'],
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[/^[*+-]/, 'BIN'],
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[/^[=<>]/, 'REL'],
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[/^[,;]/, 'PUNCT'],
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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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// Bin symbols
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'cdot', 'pm', 'div',
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// Rel symbols
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'leq', 'geq', 'neq', 'nleq', 'ngeq',
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// Open/close symbols
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'lvert', 'rvert',
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// Punct symbols
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'colon',
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// Spacing symbols
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'qquad', 'quad', ' ', 'space', ',', ':', ';',
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// Colors
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'blue', 'orange', 'pink', 'red', 'green', 'gray', 'purple',
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// Mathy functions
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"arcsin", "arccos", "arctan", "arg", "cos", "cosh", "cot", "coth", "csc",
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"deg", "dim", "exp", "hom", "ker", "lg", "ln", "log", "sec", "sin", "sinh",
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"tan", "tanh",
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// Other functions
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'dfrac', 'llap', 'rlap'
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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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if (match[1] === " ") {
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return "space";
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}
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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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