177 lines
3.5 KiB
JavaScript
177 lines
3.5 KiB
JavaScript
'use strict';
|
|
|
|
var use = require('use');
|
|
var define = require('define-property');
|
|
var debug = require('debug')('snapdragon:compiler');
|
|
var utils = require('./utils');
|
|
|
|
/**
|
|
* Create a new `Compiler` with the given `options`.
|
|
* @param {Object} `options`
|
|
*/
|
|
|
|
function Compiler(options, state) {
|
|
debug('initializing', __filename);
|
|
this.options = utils.extend({source: 'string'}, options);
|
|
this.state = state || {};
|
|
this.compilers = {};
|
|
this.output = '';
|
|
this.set('eos', function(node) {
|
|
return this.emit(node.val, node);
|
|
});
|
|
this.set('noop', function(node) {
|
|
return this.emit(node.val, node);
|
|
});
|
|
this.set('bos', function(node) {
|
|
return this.emit(node.val, node);
|
|
});
|
|
use(this);
|
|
}
|
|
|
|
/**
|
|
* Prototype methods
|
|
*/
|
|
|
|
Compiler.prototype = {
|
|
|
|
/**
|
|
* Throw an error message with details including the cursor position.
|
|
* @param {String} `msg` Message to use in the Error.
|
|
*/
|
|
|
|
error: function(msg, node) {
|
|
var pos = node.position || {start: {column: 0}};
|
|
var message = this.options.source + ' column:' + pos.start.column + ': ' + msg;
|
|
|
|
var err = new Error(message);
|
|
err.reason = msg;
|
|
err.column = pos.start.column;
|
|
err.source = this.pattern;
|
|
|
|
if (this.options.silent) {
|
|
this.errors.push(err);
|
|
} else {
|
|
throw err;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Define a non-enumberable property on the `Compiler` instance.
|
|
*
|
|
* ```js
|
|
* compiler.define('foo', 'bar');
|
|
* ```
|
|
* @name .define
|
|
* @param {String} `key` propery name
|
|
* @param {any} `val` property value
|
|
* @return {Object} Returns the Compiler instance for chaining.
|
|
* @api public
|
|
*/
|
|
|
|
define: function(key, val) {
|
|
define(this, key, val);
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Emit `node.val`
|
|
*/
|
|
|
|
emit: function(str, node) {
|
|
this.output += str;
|
|
return str;
|
|
},
|
|
|
|
/**
|
|
* Add a compiler `fn` with the given `name`
|
|
*/
|
|
|
|
set: function(name, fn) {
|
|
this.compilers[name] = fn;
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Get compiler `name`.
|
|
*/
|
|
|
|
get: function(name) {
|
|
return this.compilers[name];
|
|
},
|
|
|
|
/**
|
|
* Get the previous AST node.
|
|
*/
|
|
|
|
prev: function(n) {
|
|
return this.ast.nodes[this.idx - (n || 1)] || { type: 'bos', val: '' };
|
|
},
|
|
|
|
/**
|
|
* Get the next AST node.
|
|
*/
|
|
|
|
next: function(n) {
|
|
return this.ast.nodes[this.idx + (n || 1)] || { type: 'eos', val: '' };
|
|
},
|
|
|
|
/**
|
|
* Visit `node`.
|
|
*/
|
|
|
|
visit: function(node, nodes, i) {
|
|
var fn = this.compilers[node.type];
|
|
this.idx = i;
|
|
|
|
if (typeof fn !== 'function') {
|
|
throw this.error('compiler "' + node.type + '" is not registered', node);
|
|
}
|
|
return fn.call(this, node, nodes, i);
|
|
},
|
|
|
|
/**
|
|
* Map visit over array of `nodes`.
|
|
*/
|
|
|
|
mapVisit: function(nodes) {
|
|
if (!Array.isArray(nodes)) {
|
|
throw new TypeError('expected an array');
|
|
}
|
|
var len = nodes.length;
|
|
var idx = -1;
|
|
while (++idx < len) {
|
|
this.visit(nodes[idx], nodes, idx);
|
|
}
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Compile `ast`.
|
|
*/
|
|
|
|
compile: function(ast, options) {
|
|
var opts = utils.extend({}, this.options, options);
|
|
this.ast = ast;
|
|
this.parsingErrors = this.ast.errors;
|
|
this.output = '';
|
|
|
|
// source map support
|
|
if (opts.sourcemap) {
|
|
var sourcemaps = require('./source-maps');
|
|
sourcemaps(this);
|
|
this.mapVisit(this.ast.nodes);
|
|
this.applySourceMaps();
|
|
this.map = opts.sourcemap === 'generator' ? this.map : this.map.toJSON();
|
|
return this;
|
|
}
|
|
|
|
this.mapVisit(this.ast.nodes);
|
|
return this;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Expose `Compiler`
|
|
*/
|
|
|
|
module.exports = Compiler;
|