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import * as Utils from './utils';
import Exception from './exception';
import { COMPILER_REVISION, REVISION_CHANGES, createFrame } from './base';
export function checkRevision(compilerInfo) {
const compilerRevision = compilerInfo && compilerInfo[0] || 1,
currentRevision = COMPILER_REVISION;
if (compilerRevision !== currentRevision) {
if (compilerRevision < currentRevision) {
const runtimeVersions = REVISION_CHANGES[currentRevision],
compilerVersions = REVISION_CHANGES[compilerRevision];
throw new Exception('Template was precompiled with an older version of Handlebars than the current runtime. ' +
'Please update your precompiler to a newer version (' + runtimeVersions + ') or downgrade your runtime to an older version (' + compilerVersions + ').');
} else {
// Use the embedded version info since the runtime doesn't know about this revision yet
throw new Exception('Template was precompiled with a newer version of Handlebars than the current runtime. ' +
'Please update your runtime to a newer version (' + compilerInfo[1] + ').');
}
}
}
export function template(templateSpec, env) {
/* istanbul ignore next */
if (!env) {
throw new Exception('No environment passed to template');
}
if (!templateSpec || !templateSpec.main) {
throw new Exception('Unknown template object: ' + typeof templateSpec);
}
templateSpec.main.decorator = templateSpec.main_d;
// Note: Using env.VM references rather than local var references throughout this section to allow
// for external users to override these as psuedo-supported APIs.
env.VM.checkRevision(templateSpec.compiler);
function invokePartialWrapper(partial, context, options) {
if (options.hash) {
context = Utils.extend({}, context, options.hash);
if (options.ids) {
options.ids[0] = true;
}
}
partial = env.VM.resolvePartial.call(this, partial, context, options);
let result = env.VM.invokePartial.call(this, partial, context, options);
if (result == null && env.compile) {
options.partials[options.name] = env.compile(partial, templateSpec.compilerOptions, env);
result = options.partials[options.name](context, options);
}
if (result != null) {
if (options.indent) {
let lines = result.split('\n');
for (let i = 0, l = lines.length; i < l; i++) {
if (!lines[i] && i + 1 === l) {
break;
}
lines[i] = options.indent + lines[i];
}
result = lines.join('\n');
}
return result;
} else {
throw new Exception('The partial ' + options.name + ' could not be compiled when running in runtime-only mode');
}
}
// Just add water
let container = {
strict: function(obj, name) {
if (!(name in obj)) {
throw new Exception('"' + name + '" not defined in ' + obj);
}
return obj[name];
},
lookup: function(depths, name) {
const len = depths.length;
for (let i = 0; i < len; i++) {
if (depths[i] && depths[i][name] != null) {
return depths[i][name];
}
}
},
lambda: function(current, context) {
return typeof current === 'function' ? current.call(context) : current;
},
escapeExpression: Utils.escapeExpression,
invokePartial: invokePartialWrapper,
fn: function(i) {
let ret = templateSpec[i];
ret.decorator = templateSpec[i + '_d'];
return ret;
},
programs: [],
program: function(i, data, declaredBlockParams, blockParams, depths) {
let programWrapper = this.programs[i],
fn = this.fn(i);
if (data || depths || blockParams || declaredBlockParams) {
programWrapper = wrapProgram(this, i, fn, data, declaredBlockParams, blockParams, depths);
} else if (!programWrapper) {
programWrapper = this.programs[i] = wrapProgram(this, i, fn);
}
return programWrapper;
},
data: function(value, depth) {
while (value && depth--) {
value = value._parent;
}
return value;
},
merge: function(param, common) {
let obj = param || common;
if (param && common && (param !== common)) {
obj = Utils.extend({}, common, param);
}
return obj;
},
noop: env.VM.noop,
compilerInfo: templateSpec.compiler
};
function ret(context, options = {}) {
let data = options.data;
ret._setup(options);
if (!options.partial && templateSpec.useData) {
data = initData(context, data);
}
let depths,
blockParams = templateSpec.useBlockParams ? [] : undefined;
if (templateSpec.useDepths) {
if (options.depths) {
depths = context != options.depths[0] ? [context].concat(options.depths) : options.depths;
} else {
depths = [context];
}
}
function main(context/*, options*/) {
return '' + templateSpec.main(container, context, container.helpers, container.partials, data, blockParams, depths);
}
main = executeDecorators(templateSpec.main, main, container, options.depths || [], data, blockParams);
return main(context, options);
}
ret.isTop = true;
ret._setup = function(options) {
if (!options.partial) {
container.helpers = container.merge(options.helpers, env.helpers);
if (templateSpec.usePartial) {
container.partials = container.merge(options.partials, env.partials);
}
if (templateSpec.usePartial || templateSpec.useDecorators) {
container.decorators = container.merge(options.decorators, env.decorators);
}
} else {
container.helpers = options.helpers;
container.partials = options.partials;
container.decorators = options.decorators;
}
};
ret._child = function(i, data, blockParams, depths) {
if (templateSpec.useBlockParams && !blockParams) {
throw new Exception('must pass block params');
}
if (templateSpec.useDepths && !depths) {
throw new Exception('must pass parent depths');
}
return wrapProgram(container, i, templateSpec[i], data, 0, blockParams, depths);
};
return ret;
}
export function wrapProgram(container, i, fn, data, declaredBlockParams, blockParams, depths) {
function prog(context, options = {}) {
let currentDepths = depths;
if (depths && context != depths[0]) {
currentDepths = [context].concat(depths);
}
return fn(container,
context,
container.helpers, container.partials,
options.data || data,
blockParams && [options.blockParams].concat(blockParams),
currentDepths);
}
prog = executeDecorators(fn, prog, container, depths, data, blockParams);
prog.program = i;
prog.depth = depths ? depths.length : 0;
prog.blockParams = declaredBlockParams || 0;
return prog;
}
export function resolvePartial(partial, context, options) {
if (!partial) {
if (options.name === '@partial-block') {
let data = options.data;
while (data['partial-block'] === noop) {
data = data._parent;
}
partial = data['partial-block'];
data['partial-block'] = noop;
} else {
partial = options.partials[options.name];
}
} else if (!partial.call && !options.name) {
// This is a dynamic partial that returned a string
options.name = partial;
partial = options.partials[partial];
}
return partial;
}
export function invokePartial(partial, context, options) {
options.partial = true;
if (options.ids) {
options.data.contextPath = options.ids[0] || options.data.contextPath;
}
let partialBlock;
if (options.fn && options.fn !== noop) {
options.data = createFrame(options.data);
partialBlock = options.data['partial-block'] = options.fn;
if (partialBlock.partials) {
options.partials = Utils.extend({}, options.partials, partialBlock.partials);
}
}
if (partial === undefined && partialBlock) {
partial = partialBlock;
}
if (partial === undefined) {
throw new Exception('The partial ' + options.name + ' could not be found');
} else if (partial instanceof Function) {
return partial(context, options);
}
}
export function noop() { return ''; }
function initData(context, data) {
if (!data || !('root' in data)) {
data = data ? createFrame(data) : {};
data.root = context;
}
return data;
}
function executeDecorators(fn, prog, container, depths, data, blockParams) {
if (fn.decorator) {
let props = {};
prog = fn.decorator(prog, props, container, depths && depths[0], data, blockParams, depths);
Utils.extend(prog, props);
}
return prog;
}
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