angular-cn/aio/tools/transforms/examples-package/services/region-parser.js

143 lines
4.5 KiB
JavaScript

const blockC = require('./region-matchers/block-c');
const html = require('./region-matchers/html');
const inlineC = require('./region-matchers/inline-c');
const inlineCOnly = require('./region-matchers/inline-c-only');
const inlineHash = require('./region-matchers/inline-hash');
const DEFAULT_PLASTER = '. . .';
const {mapObject} = require('../../helpers/utils');
module.exports = function regionParser() {
return regionParserImpl;
};
regionParserImpl.regionMatchers = {
ts: inlineC,
js: inlineC,
es6: inlineC,
dart: inlineC,
html: html,
css: blockC,
yaml: inlineHash,
jade: inlineCOnly,
json: inlineC,
'json.annotated': inlineC
};
/**
* @param contents string
* @param fileType string
* @returns {contents: string, regions: {[regionName: string]: string}}
*/
function regionParserImpl(contents, fileType) {
const regionMatcher = regionParserImpl.regionMatchers[fileType];
const openRegions = [];
const regionMap = {};
if (regionMatcher) {
let plaster = regionMatcher.createPlasterComment(DEFAULT_PLASTER);
const lines = contents.split(/\r?\n/).filter((line, index) => {
const startRegion = line.match(regionMatcher.regionStartMatcher);
const endRegion = line.match(regionMatcher.regionEndMatcher);
const updatePlaster = line.match(regionMatcher.plasterMatcher);
// start region processing
if (startRegion) {
// open up the specified region
const regionNames = getRegionNames(startRegion[1]);
if (regionNames.length === 0) {
regionNames.push('');
}
regionNames.forEach(regionName => {
const region = regionMap[regionName];
if (region) {
if (region.open) {
throw new RegionParserError(
`Tried to open a region, named "${regionName}", that is already open`, index);
}
region.open = true;
if (plaster) {
region.lines.push(plaster);
}
} else {
regionMap[regionName] = {lines: [], open: true};
}
openRegions.push(regionName);
});
// end region processing
} else if (endRegion) {
if (openRegions.length === 0) {
throw new RegionParserError('Tried to close a region when none are open', index);
}
// close down the specified region (or most recent if no name is given)
const regionNames = getRegionNames(endRegion[1]);
if (regionNames.length === 0) {
regionNames.push(openRegions[openRegions.length - 1]);
}
regionNames.forEach(regionName => {
const region = regionMap[regionName];
if (!region || !region.open) {
throw new RegionParserError(
`Tried to close a region, named "${regionName}", that is not open`, index);
}
region.open = false;
removeLast(openRegions, regionName);
});
// doc plaster processing
} else if (updatePlaster) {
const plasterString = updatePlaster[1].trim();
plaster = plasterString ? regionMatcher.createPlasterComment(plasterString) : '';
// simple line of content processing
} else {
openRegions.forEach(regionName => regionMap[regionName].lines.push(line));
// do not filter out this line from the content
return true;
}
// this line contained an annotation so let's filter it out
return false;
});
if (!regionMap['']) {
regionMap[''] = {lines};
}
return {
contents: lines.join('\n'),
regions: mapObject(regionMap, (regionName, region) => leftAlign(region.lines).join('\n'))
};
} else {
return {contents, regions: {}};
}
}
function getRegionNames(input) {
return (input.trim() === '') ? [] : input.split(',').map(name => name.trim());
}
function removeLast(array, item) {
const index = array.lastIndexOf(item);
array.splice(index, 1);
}
function leftAlign(lines) {
let indent = Number.MAX_VALUE;
lines.forEach(line => {
const lineIndent = line.search(/\S/);
if (lineIndent !== -1) {
indent = Math.min(lineIndent, indent);
}
});
return lines.map(line => line.substr(indent));
}
function RegionParserError(message, index) {
const lineNum = index + 1;
this.message = `regionParser: ${message} (at line ${lineNum}).`;
this.lineNum = lineNum;
this.stack = (new Error()).stack;
}
RegionParserError.prototype = Object.create(Error.prototype);
RegionParserError.prototype.constructor = RegionParserError;