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index.js
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index.js
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'use strict';
const headerHandler = require('./handlers/header');
const tablesHandler = require('./handlers/tables');
const blocksHandler = require('./handlers/blocks');
const entitiesHandler = require('./handlers/entities');
const toLines = (string) => {
const lines = string.split(/\r\n|\r|\n/g);
const contentLines = lines.filter((l) => {
return l.trim !== 'EOF';
});
return contentLines;
};
// Parse the value into the native representation
const parseValue = (type, value) => {
if ((type >= 10) && (type < 60)) {
return parseFloat(value, 10);
} else if ((type >= 210) && (type < 240)) {
return parseFloat(value, 10);
} else if ((type >= 60) && (type < 100)) {
return parseInt(value, 10);
} else {
return value;
}
};
// Content lines are alternate lines of type and value
const convertToTypesAndValues = (contentLines) => {
let state = 'type';
let type;
const typesAndValues = [];
for(let line of contentLines) {
if (state === 'type') {
type = parseInt(line, 10);
state = 'value';
} else {
typesAndValues.push([type, parseValue(type, line)]);
state = 'type';
}
}
return typesAndValues;
};
const separateSections = (tuples) => {
let sectionTuples;
return tuples.reduce((sections, tuple) => {
if ((tuple[0] === 0) && (tuple[1] === 'SECTION')) {
sectionTuples = [];
} else if ((tuple[0] === 0) && (tuple[1] === 'ENDSEC')) {
sections.push(sectionTuples);
sectionTuples = undefined;
} else if (sectionTuples !== undefined) {
sectionTuples.push(tuple);
}
return sections;
}, []);
};
// Each section start with the type tuple, then proceeds
// with the contents of the section
const reduceSection = (acc, section) => {
const sectionType = section[0][1];
const contentTuples = section.slice(1);
switch(sectionType) {
case 'HEADER':
acc.header = headerHandler(contentTuples);
break;
case 'TABLES':
acc.tables = tablesHandler(contentTuples);
break;
case 'BLOCKS':
acc.blocks = blocksHandler(contentTuples);
break;
case 'ENTITIES':
acc.entities = entitiesHandler(contentTuples);
break;
default:
}
return acc;
};
const parseString = (string) => {
const lines = toLines(string);
const tuples = convertToTypesAndValues(lines);
const sections = separateSections(tuples);
const result = sections.reduce(reduceSection, {
// In the event of empty sections
header: {},
blocks: [],
entities: [],
});
return result;
};
module.exports.config = require('./config');
module.exports.parseString = parseString;
module.exports.denormalise = require('./denormalise');
module.exports.entityToPolyline = require('./entityToPolyline');
module.exports.BoundingBox = require('./BoundingBox');
module.exports.colors = require('./util/colors');
module.exports.toSVG = require('./toSVG');
module.exports.groupEntitiesByLayer = require('./groupEntitiesByLayer');