Merge pull request #347 from gagern/splitEnvironments
Split up environments list into calls to defineEnvironment
This commit is contained in:
Kevin Barabash
commit
d7d1367558
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@ -38,141 +38,141 @@ function parseArray(parser, pos, mode, result) {
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}
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/*
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* An environment definition is very similar to a function definition.
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* Each element of the following array may contain
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* - names: The names associated with a function. This can be used to
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* share one implementation between several similar environments.
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* An environment definition is very similar to a function definition:
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* it is declared with a name or a list of names, a set of properties
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* and a handler containing the actual implementation.
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*
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* The properties include:
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* - numArgs: The number of arguments after the \begin{name} function.
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* - argTypes: (optional) Just like for a function
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* - allowedInText: (optional) Whether or not the environment is allowed inside
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* text mode (default false) (not enforced yet)
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* - numOptionalArgs: (optional) Just like for a function
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* - handler: The function that is called to handle this environment.
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* It will receive the following arguments:
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* - pos: the current position of the parser.
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* - mode: the current parsing mode.
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* - envName: the name of the environment, one of the listed names.
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* - [args]: the arguments passed to \begin.
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* - positions: the positions associated with these arguments.
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* A bare number instead of that object indicates the numArgs value.
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*
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* The handler function will receive the following arguments:
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* - pos: the current position of the parser.
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* - mode: the current parsing mode.
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* - envName: the name of the environment, one of the listed names.
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* - [args]: the arguments passed to \begin.
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* - positions: the positions associated with these arguments.
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* The handler is called with `this` referring to the parser.
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* It must return a ParseResult.
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*/
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var environmentDefinitions = [
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// Arrays are part of LaTeX, defined in lttab.dtx so its documentation
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// is part of the source2e.pdf file of LaTeX2e source documentation.
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{
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names: ["array"],
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numArgs: 1,
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handler: function(pos, mode, envName, colalign, positions) {
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var parser = this;
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colalign = colalign.value.map ? colalign.value : [colalign];
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var cols = colalign.map(function(node) {
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var ca = node.value;
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if ("lcr".indexOf(ca) !== -1) {
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return {
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type: "align",
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align: ca
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};
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} else if (ca === "|") {
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return {
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type: "separator",
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separator: "|"
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};
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}
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throw new ParseError(
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"Unknown column alignment: " + node.value,
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parser.lexer, positions[1]);
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});
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var res = {
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type: "array",
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cols: cols,
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hskipBeforeAndAfter: true // \@preamble in lttab.dtx
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};
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res = parseArray(parser, pos, mode, res);
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return res;
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}
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},
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// The matrix environments of amsmath builds on the array environment
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// of LaTeX, which is discussed above.
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{
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names: [
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"matrix",
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"pmatrix",
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"bmatrix",
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"Bmatrix",
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"vmatrix",
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"Vmatrix"
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],
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handler: function(pos, mode, envName) {
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var delimiters = {
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"matrix": null,
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"pmatrix": ["(", ")"],
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"bmatrix": ["[", "]"],
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"Bmatrix": ["\\{", "\\}"],
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"vmatrix": ["|", "|"],
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"Vmatrix": ["\\Vert", "\\Vert"]
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}[envName];
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var res = {
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type: "array",
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hskipBeforeAndAfter: false // \hskip -\arraycolsep in amsmath
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};
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res = parseArray(this, pos, mode, res);
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if (delimiters) {
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res.result = new ParseNode("leftright", {
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body: [res.result],
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left: delimiters[0],
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right: delimiters[1]
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}, mode);
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}
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return res;
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}
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},
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// A cases environment (in amsmath.sty) is almost equivalent to
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// \def\arraystretch{1.2}%
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// \left\{\begin{array}{@{}l@{\quad}l@{}} … \end{array}\right.
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{
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names: ["cases"],
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handler: function(pos, mode, envName) {
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var res = {
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type: "array",
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arraystretch: 1.2,
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cols: [{
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type: "align",
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align: "l",
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pregap: 0,
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postgap: fontMetrics.metrics.quad
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}, {
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type: "align",
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align: "l",
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pregap: 0,
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postgap: 0
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}]
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};
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res = parseArray(this, pos, mode, res);
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res.result = new ParseNode("leftright", {
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body: [res.result],
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left: "\\{",
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right: "."
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}, mode);
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return res;
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}
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function defineEnvironment(names, props, handler) {
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if (typeof names === "string") {
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names = [names];
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}
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];
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module.exports = (function() {
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// nested function so we don't leak i and j into the module scope
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var exports = {};
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for (var i = 0; i < environmentDefinitions.length; ++i) {
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var def = environmentDefinitions[i];
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def.greediness = 1;
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def.allowedInText = !!def.allowedInText;
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def.numArgs = def.numArgs || 0;
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def.numOptionalArgs = def.numOptionalArgs || 0;
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for (var j = 0; j < def.names.length; ++j) {
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exports[def.names[j]] = def;
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}
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if (typeof props === "number") {
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props = { numArgs: props };
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}
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return exports;
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})();
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// Set default values of environments
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var data = {
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numArgs: props.numArgs || 0,
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argTypes: props.argTypes,
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greediness: 1,
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allowedInText: !!props.allowedInText,
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numOptionalArgs: props.numOptionalArgs || 0,
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handler: handler
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};
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for (var i = 0; i < names.length; ++i) {
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module.exports[names[i]] = data;
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}
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}
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// Arrays are part of LaTeX, defined in lttab.dtx so its documentation
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// is part of the source2e.pdf file of LaTeX2e source documentation.
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defineEnvironment("array", {
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numArgs: 1
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}, function(pos, mode, envName, colalign, positions) {
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var parser = this;
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colalign = colalign.value.map ? colalign.value : [colalign];
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var cols = colalign.map(function(node) {
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var ca = node.value;
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if ("lcr".indexOf(ca) !== -1) {
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return {
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type: "align",
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align: ca
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};
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} else if (ca === "|") {
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return {
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type: "separator",
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separator: "|"
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};
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}
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throw new ParseError(
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"Unknown column alignment: " + node.value,
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parser.lexer, positions[1]);
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});
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var res = {
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type: "array",
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cols: cols,
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hskipBeforeAndAfter: true // \@preamble in lttab.dtx
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};
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res = parseArray(parser, pos, mode, res);
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return res;
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});
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// The matrix environments of amsmath builds on the array environment
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// of LaTeX, which is discussed above.
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defineEnvironment([
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"matrix",
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"pmatrix",
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"bmatrix",
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"Bmatrix",
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"vmatrix",
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"Vmatrix"
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], {
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}, function(pos, mode, envName) {
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var delimiters = {
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"matrix": null,
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"pmatrix": ["(", ")"],
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"bmatrix": ["[", "]"],
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"Bmatrix": ["\\{", "\\}"],
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"vmatrix": ["|", "|"],
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"Vmatrix": ["\\Vert", "\\Vert"]
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}[envName];
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var res = {
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type: "array",
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hskipBeforeAndAfter: false // \hskip -\arraycolsep in amsmath
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};
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res = parseArray(this, pos, mode, res);
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if (delimiters) {
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res.result = new ParseNode("leftright", {
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body: [res.result],
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left: delimiters[0],
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right: delimiters[1]
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}, mode);
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}
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return res;
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});
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// A cases environment (in amsmath.sty) is almost equivalent to
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// \def\arraystretch{1.2}%
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// \left\{\begin{array}{@{}l@{\quad}l@{}} … \end{array}\right.
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defineEnvironment("cases", {
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}, function(pos, mode, envName) {
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var res = {
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type: "array",
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arraystretch: 1.2,
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cols: [{
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type: "align",
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align: "l",
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pregap: 0,
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postgap: fontMetrics.metrics.quad
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}, {
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type: "align",
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align: "l",
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pregap: 0,
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postgap: 0
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}]
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};
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res = parseArray(this, pos, mode, res);
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res.result = new ParseNode("leftright", {
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body: [res.result],
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left: "\\{",
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right: "."
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}, mode);
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return res;
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});
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