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/*global define */
import {isArray} from '../utils';
let SourceNode;
try {
/* istanbul ignore next */
if (typeof define !== 'function' || !define.amd) {
// We don't support this in AMD environments. For these environments, we asusme that
// they are running on the browser and thus have no need for the source-map library.
let SourceMap = require('source-map');
SourceNode = SourceMap.SourceNode;
}
} catch (err) {
/* NOP */
}
/* istanbul ignore if: tested but not covered in istanbul due to dist build */
if (!SourceNode) {
SourceNode = function(line, column, srcFile, chunks) {
this.src = '';
if (chunks) {
this.add(chunks);
}
};
/* istanbul ignore next */
SourceNode.prototype = {
add: function(chunks) {
if (isArray(chunks)) {
chunks = chunks.join('');
}
this.src += chunks;
},
prepend: function(chunks) {
if (isArray(chunks)) {
chunks = chunks.join('');
}
this.src = chunks + this.src;
},
toStringWithSourceMap: function() {
return {code: this.toString()};
},
toString: function() {
return this.src;
}
};
}
function castChunk(chunk, codeGen, loc) {
if (isArray(chunk)) {
let ret = [];
for (let i = 0, len = chunk.length; i < len; i++) {
ret.push(codeGen.wrap(chunk[i], loc));
}
return ret;
} else if (typeof chunk === 'boolean' || typeof chunk === 'number') {
// Handle primitives that the SourceNode will throw up on
return chunk + '';
}
return chunk;
}
function CodeGen(srcFile) {
this.srcFile = srcFile;
this.source = [];
}
CodeGen.prototype = {
isEmpty() {
return !this.source.length;
},
prepend: function(source, loc) {
this.source.unshift(this.wrap(source, loc));
},
push: function(source, loc) {
this.source.push(this.wrap(source, loc));
},
merge: function() {
let source = this.empty();
this.each(function(line) {
source.add([' ', line, '\n']);
});
return source;
},
each: function(iter) {
for (let i = 0, len = this.source.length; i < len; i++) {
iter(this.source[i]);
}
},
empty: function() {
let loc = this.currentLocation || {start: {}};
return new SourceNode(loc.start.line, loc.start.column, this.srcFile);
},
wrap: function(chunk, loc = this.currentLocation || {start: {}}) {
if (chunk instanceof SourceNode) {
return chunk;
}
chunk = castChunk(chunk, this, loc);
return new SourceNode(loc.start.line, loc.start.column, this.srcFile, chunk);
},
functionCall: function(fn, type, params) {
params = this.generateList(params);
return this.wrap([fn, type ? '.' + type + '(' : '(', params, ')']);
},
quotedString: function(str) {
return '"' + (str + '')
.replace(/\\/g, '\\\\')
.replace(/"/g, '\\"')
.replace(/\n/g, '\\n')
.replace(/\r/g, '\\r')
.replace(/\u2028/g, '\\u2028') // Per Ecma-262 7.3 + 7.8.4
.replace(/\u2029/g, '\\u2029') + '"';
},
objectLiteral: function(obj) {
let pairs = [];
for (let key in obj) {
if (obj.hasOwnProperty(key)) {
let value = castChunk(obj[key], this);
if (value !== 'undefined') {
pairs.push([this.quotedString(key), ':', value]);
}
}
}
let ret = this.generateList(pairs);
ret.prepend('{');
ret.add('}');
return ret;
},
generateList: function(entries) {
let ret = this.empty();
for (let i = 0, len = entries.length; i < len; i++) {
if (i) {
ret.add(',');
}
ret.add(castChunk(entries[i], this));
}
return ret;
},
generateArray: function(entries) {
let ret = this.generateList(entries);
ret.prepend('[');
ret.add(']');
return ret;
}
};
export default CodeGen;
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